Malicious PDF — malware analysis report

Static analysis result for SHA-256 82dca441edf76ac0…

MALICIOUS

PDF

92.6 KB Created: 2021-09-20 02:30:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 78acfe9e7e5afae8e50dcb74cded9795 SHA-1: 98b75efcdc065ff0db573665ab25b6a4c2f55ad1 SHA-256: 82dca441edf76ac0ab713ccbc5127c20a0de1655278219336bd73c7f3889832f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, including one pointing to a compromised WordPress upload directory, suggesting it functions as a link farm for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://garglob.ru/uplcv?utm_term=age+of+sigmar+cities+of+sigmar+pdf PDF link annotation
    • http://abbeytraining.net/userfiles/file/57383960444.pdfIn PDF document text
    • http://smogy.ru/files/files/duwolumufa.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/papowaxano.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613249b29b9a6---luzed.pdfIn PDF document text
    • http://narzedziascierne.eu/Upload/file/36442119826.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/84119623629.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/20121501646.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/5933852517.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/28655226091.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1614586975325f---12473202474.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c384f06d9e---xijikebamujamu.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/xesuruzo.pdfIn PDF document text
    • http://lamay.de/userfiles/file/78952492464.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/7407f3734b25f7bd5cf47126e62920fb/89820481970.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/forewajefavuwodukobabu.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/88386686738f56c795c3c0accb14ad01/dovekifanameniwegelam.pdfIn PDF document text
    • https://fpcofmacon.com/nbloom/fckuploads/file/mavesogaxibajagona.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/59072be05a328018013d329e4074724b/xabomajagowolu.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/lizovapezo.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369a6e95773---80830740309.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/54019172178.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/5319474751.pdfIn PDF document text
    • http://capital96.com/userfiles/file/24888068534.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/t4usn1770utjsci53ht8b5m655/zuwibabosiromod.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/geberadijupinujaw.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_off00010535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10535 10796 bytes
SHA-256: 76506814ccb04c7bf37ed00b4d36513ca9a6f9eac1e5e9f157f1417a25581373
font_01_sfnt_off00011df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF0 18264 bytes
SHA-256: 64dbaa4d4dc421ea7ac9bc0f57cadb8f4c67a190001aab203c00a07ae5701cd2
font_02_sfnt_off00014c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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