Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb49d384ff675ff4…

MALICIOUS

PDF

88.2 KB Created: 2021-07-29 17:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 878624200e26b6298024d1e334d2eba7 SHA-1: 35237f5538640aebe4c9cd946e5b7308df657371 SHA-256: eb49d384ff675ff4ec52d7fe5523509187052885b7afeef213d8e773ce4e3d66
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous compromised websites and potentially malicious PDF files hosted on various domains. The presence of multiple external URIs and compromised CMS upload links suggests an attempt to distribute phishing lures or second-stage malware. No scripts were extracted, but the overall structure points to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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
  • 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://nomylo.ru/uplcv?utm_term=when+acetic+acid+reacts+with+ethyl+alcohol+in+the+presence+of+conc.+sulphuric+acid+is PDF link annotation
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/9acfec5a513a3086f4c31ef5da5c8ef1/koxezoriz.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/27fcfef98184c59873f576b68cc5aa1b/sarigogubepilame.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/3458141017.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816950a8ccc---keferazidujufesikoxupugum.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/7d2104bf8926b56dfa05864317ef96c2/fojugejamifumawesur.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/94553545444.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160849ce354018---befilifeji.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e04645e7733---37148679661.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/66460668040.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081fa35b2697---piwuganafikafosodufakafut.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e438e74699---82792681888.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/e3diaj2dcb6bmq4jn587v88glc/dudolomozopawinal.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8491893238---87239232829.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/6j8617u4s3vaj16gd1fkm8g0l7/92090637020.pdfIn PDF document text
    • https://tessuno.com/upload/files/60e78f4a4e693.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/31311171726.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160809351b59c5---dosuvafabejepab.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/64506090699.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df04c312459---36654276881.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/3a28038c2ec68d17935d8c8f3e70303f/difivib.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160861e33a9ab0---68919405729.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f043b4c8bf---86749111334.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/44571356132.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE0 11076 bytes
SHA-256: 70c9f0926e0270ea07d7f7cb9692003073a390d94104255bb9594809dccefb7d
font_02_sfnt_off000124ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AE 17276 bytes
SHA-256: f4f2dff52dbe8171fe20df4a72e98a2ecd058de8d03f80b6b92f373d97b900a5

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