Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf3351430189e17…

MALICIOUS

PDF

75.8 KB Created: 2021-09-04 07:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e532b12a824f5476777855aa3cb44b6f SHA-1: e3621aff38b23723df7dc25f46d9a89a52bc2268 SHA-256: 7bf3351430189e1772e258f7f6a18bc900da8f16dba6fa20948c9f4b9d7049da
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of a 'download' button lure further supports a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://chcial.ru/uplcv?utm_term=acrobat+split+pdf+into+separate+pages PDF link annotation
    • http://aarogyamedico.com/userfiles/file/doxixepu.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/13793444772.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/pusexalet.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/42358055900.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/83975238449.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/4bbdabf6f3f0fa53a95ade20a4c9e1d9/sikikawematineja.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/81357652975.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/solegosixozozu.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/gonabozitapejofi.pdfIn PDF document text
    • http://lohs69.com/clients/82366/File/niwinupomuman.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b803aae8bcc---3076795469.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c11dbf813---baxafomowok.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a89b9f014c---33381593615.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/41c066e4921542c629a81a62f8b3aba6/gofotojexeginexeken.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/43354013861.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5e8557bfd---87405116813.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/43835085737.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/33767811704.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/3d66f1cfd4e24a809a75fdfe03c8add9/79438712165.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/2784410883.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/60ik5qq10bkcgcinnt7kuqbp54/galagifufikutuminubotu.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_off0000c369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC369 17384 bytes
SHA-256: fb054d3da841bef3adf0fa77ebf87a1d244326a0da7427e67aaec62abf8188c6
font_01_sfnt_off0000f0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E8 10916 bytes
SHA-256: 8f47399d2144b42b55c60a4f5f0e4a0b464bae2385f46843c096aa87376f8d77
font_02_sfnt_off000109de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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