Malicious PDF — malware analysis report

Static analysis result for SHA-256 3852bc43896b80c0…

MALICIOUS

PDF

92.6 KB Created: 2021-07-01 23:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: acd99afd75f21c1b26d4bbe755296419 SHA-1: 55585c2792aafe4a73975bfc87a02a3f276daadc SHA-256: 3852bc43896b80c09541078283d22f21c92a99218b6c8bda3262fec4d9030e7a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload storage and other disposable hosting sites, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further supporting its role as a lure rather than informational content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://ytdrive.com/CKEdit/upload/files/jewisononururorutagesiv.pdf In PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c34f07e499f---katifi.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/cf475eb51d083e269fef93b6ec7a4809/68053183376.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b160f3bcb04---pujizipafarimotiseru.pdfIn PDF document text
    • https://papiratisk.cz/soubory/11155577809.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077cac59a625---karimuvudaxibinirobidizow.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/mazozomawuxufefogexuxe.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8cb4f03af---wenemuganefimalidalovinu.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/gawas.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/44628575155.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/09cd9a5418539c0d0fc0a3093c179c7f/putiri.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/3d193df11378a9b62e6f5d1d4113a388/dukobiwuromozezagex.pdfIn PDF document text
    • http://hubbardfamilycircle.com/clients/62940/File/16049080800.pdfIn PDF document text
    • http://shosholoza.de/file/morujesibugigidosaburulot.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/d04387d322e42a277d770a3961901a52/1925178993.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/af53ab98607bba5e8938285a0832e1f0/91840360529.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/ooktj4pgh572dnagjrnl2j5i61/falokedurevipa.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/daposevujajifopiwuti.pdfIn PDF document text
    • http://merwepizza.com/upload/file/24879195641.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/51055a4e8c2d8b6736c45aa699f02672/bevivo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b4ff5a724---87078549928.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/82577438490.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=the+atomic+number+of+the+first+20+elementsPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/0a859d8dd60c419bc0803064305ec508/kikazedakotil.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_off00010591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10591 17384 bytes
SHA-256: dbe8c67dab299a05a5bce483076916f84d9f236f09795749abb779d99e8eb2ae
font_01_sfnt_off0001339f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1339F 11048 bytes
SHA-256: 74de7fe28b03d12e842c9dbeed60f7c24dc8f1ab881fef3928c7475490bf1c8e
font_02_sfnt_off00014d2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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