Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cceef7248468507…

MALICIOUS

PDF

86.2 KB Created: 2021-08-23 16:22:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4f027d983cef085b8c25efd0f045ae73 SHA-1: a50f0f02ffd91346ae9fb2f63bcbe57aaf4b4b74 SHA-256: 4cceef7248468507790d148726270ffac30f44e16c0a8a91972716b8552d454d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO poisoning campaigns. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific user lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://aashianarealty.com/file/vakovibipemuni.pdf In PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/wikugexukewugirodiviz.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/vuduwisamotegazin.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607aefce2a632---vaxuluk.pdfIn PDF document text
    • http://status.cz/UserFiles/File/sejinipatizofuxojadilotud.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/leguwoxadevuvolovaguvo.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/19132366019.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/masovawefirinofim.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e293820c9---xujogoxobixasokeji.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/76553661191.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/90166513733.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eb10c6bd1a9fb2e6b009d79cafa95995/65420799868.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/30862737759.pdfIn PDF document text
    • http://canvangdientu.com/images/file/tuliwetufasega.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/tukidemasobo.pdfIn PDF document text
    • https://isosklo.cz/uploads/60935668860.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d0e7f2bee---zorolarajawobazine.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1608944de1631d---64560101186.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/eb1b6caba5c745222b592483f85af83a/sekiw.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/26570810322.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a28bb2a48---31280059978.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/93725009270.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812ddc8b22b---13493392293.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=french+bowline+knotPDF link annotation
    • 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_off0000f1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AF 10292 bytes
SHA-256: 63290f87665a4544bdd632edac965a10b8517da4174bbe2f7797afd9ac7b6f3f
font_01_sfnt_off000108bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BD 16360 bytes
SHA-256: 077e5bef288081fe86989f9dde322ce3933c44e89ec9a785833e71d69cc8c8aa
font_02_sfnt_off00013334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13334 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1