Malicious PDF — malware analysis report

Static analysis result for SHA-256 76da4ab000d395ab…

MALICIOUS

PDF

68.7 KB Created: 2021-09-25 11:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: bc5fda3df9da3946fdcb0f4a4d1313c3 SHA-1: 6068f5c3b1f0b10659fc42f23ac057781e2f287c SHA-256: 76da4ab000d395abc8b97df2cf5ca70e30a2eff2a2bc77cc7ea2cb15b481afb9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm, suggesting it's designed to redirect users to potentially harmful websites. The presence of compromised CMS upload links further supports this, as these are often used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://wastran.ru/uplcv?utm_term=should+i+download+antivirus+for+my+android+phone PDF link annotation
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vajavolitunipelefikon.pdfIn PDF document text
    • http://e-district.org/userfiles/file/38710324569.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/wilapopasoxox.pdfIn PDF document text
    • https://isosklo.cz/uploads/33813590674.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b75537f3a9---92550975248.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136cb66b271a---80841481125.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/lized.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/faveropipetaduzotuxodix.pdfIn PDF document text
    • http://pronobile.de/catalog/file/rowewulimagexoruwivugowa.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/9497023980.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/duveladaleke.pdfIn PDF document text
    • http://dhf-china.com/d/files/lupenokinetudisumepu.pdfIn PDF document text
    • https://primer-spb.ru/files/files/1037890918.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9a23bfbf27c4d8f947a8ff14efbfd0ad/kiwowamor.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/rerufowejol.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/35932601713.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/208ce90ceed6a4d2f1a87c65694fee14/79572613473.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/jagif.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/gibax.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/kevuxeribetuwalekid.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/53fa5e4e4bad352bea125485890aa2e9/99436625718.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/bozetoxozemezunapazaluba.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_off0000ad63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD63 11204 bytes
SHA-256: 5e368137e6191a4b1138f50a41eedab221ad790f98b1c989792db4e8c49097a6
font_01_sfnt_off0000c781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC781 14844 bytes
SHA-256: d32e180d9af66042b132a57931c8064bf6089d203d8e11900e0b3ca52a06d7ae
font_02_sfnt_off0000ed46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1