Malicious PDF — malware analysis report

Static analysis result for SHA-256 a998d35fe485e86b…

MALICIOUS

PDF

146.8 KB Created: 2021-07-03 00:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 23eaea985e3de624dd5c0fddea342181 SHA-1: 09cda0b0641a4d12a6339ad0efc5ff6d32057244 SHA-256: a998d35fe485e86bf569033a49d767e58b0a3291aeb8c8c8e3fdfb6e09bc3bb2
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of urgency lures and download button text further supports the phishing and malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9243

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://laborke.ru/uplcv?utm_term=r+kelly+chocolate+factory+zip+file+download PDF link annotation
    • http://nexxosrealty.com/userfiles/files/61367206173.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/bapede.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092414e7aad7---76547780022.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/61ce6ba108019d810ca1ad8303b44944/jalanigab.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160724e35a4807---devovenovob.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/da264d3dc5d09bb03287d6711f206a38/16841220813.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/4a87c4cc2f29682392e61adba7a2d019/tudokemapanamive.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160851aa3bffc7---nabonu.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/2881a60a324fd2c93c6a1af42dcddf68/datubabozadig.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/0t7pt0f2mov1afp00veo0k0ran/tidelovireverakowobedike.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/74983438006.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e867546fec---32547691302.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160702231d80e9---92330117903.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707bcae4173---dilinurefapi.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/7r2tkr1c7gl7ru29201frllken/jusojobij.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/0c318c708d24466f0fc1d5e9b4faa910/65493673391.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c5d8188b3---38873845353.pdfIn PDF document text
    • http://heizler.hu/files/file/nejofurufidutikajapiwubaf.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/7prbmaptiebcfhja9d16dllk34/77333517930.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0c5c3be36---bikozanutovoda.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c55809e7db0---92847948131.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/9909535613.pdfIn PDF document text
    • http://usmleworkout.com/files/file/54666505864.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E61 18008 bytes
SHA-256: 6005ed571f202d30d3bb5a37063fb4b3918120b3c11670a282706f1262539334
font_01_sfnt_off0001ba5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001d271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D271 22796 bytes
SHA-256: a7a9a1e61b5d46c980cfa815b1cde88793f0489907e046220500386873d2f620
font_03_sfnt_off00020c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20C99 6252 bytes
SHA-256: 812d44b44b486de25560dee348ec014dd50b2cc79052ba9c4d4e7d568edc30b3
font_04_sfnt_off000222f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x222F2 10948 bytes
SHA-256: 5fa24bdfac67a54b5c44dd2d2106eed360bc9be16fcf1f656fc612fe410bb0af

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