Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e4ac276858d54c2…

MALICIOUS

PDF

85.5 KB Created: 2021-06-28 02:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d380677a10558ea9a5ddc2f404e137a7 SHA-1: 37ef86cb69860ef312b999ce2d2cef4f9ccdd177 SHA-256: 8e4ac276858d54c2ca3b88aa4b2499a379d7fee13c6d5f0da815a0fb712ae2f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded URLs are consistent with spearphishing attachments used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://garglob.ru/uplcv?utm_term=world+no+1+powerful+country
    • http://optimaglobal.net/ckupload/files/43674832794.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/ctg4haefl14c3c8099k4dg3skn/52582440368.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160939f56a2974---54018557663.pdf
    • http://lideparts.com/userfiles/file/1622924419.pdf
    • http://funperm.ru/content/file/86818455862.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c328f44f226---zavojawugomodopa.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1609214d11c68f---33329484426.pdf
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/82797610434.pdf
    • http://studiocinti.eu/userfiles/files/gixaduzogesotifosofel.pdf
    • http://jtour.vn/userfiles/file/zunebekaseribevosi.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16074256057077---rirewinaj.pdf
    • http://51-lq.com/userfiles/file///90398686729.pdf
    • https://aduanaldelvalle.com/userfiles/file/vonibinuxalekurad.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0bhtkemo17ppuem4q000aofb45/nabinelajetekix.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/f3f9186416d3b7212357a9a1bd42a98d/zudipalufajazekaberekuwi.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/csupff3st4vhdcpiohehc4kfnc/tegunatozigabigalux.pdf
    • https://angkalaris.com/contents//files/54738131148.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160940c3382910---50112196467.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/ad56c2722681d5824f2be850298cc443/11005758135.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608beaa30053b---mujigugibofikudurub.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1848380aa---penunapakam.pdf
    • http://vasvaripalmuzeum.hu/upload/file/93191439504.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/db448f6b6df0e4da8967da584599d6c3/72239876905.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ead3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD3 16792 bytes
font_01_sfnt_off000102e5.bin
6d07df538f31f33f8963e9465e18ed7ebc12acf3ee8210612fbf9da9ffb4d981
pdf-font-stream PDF embedded font (sfnt) at offset 0x102E5 18088 bytes
font_02_sfnt_off000130ea.bin
4fb5d571c876b44cd6808dcb54d523b2e38161eae059b8d9a08b24593149c737
pdf-font-stream PDF embedded font (sfnt) at offset 0x130EA 10536 bytes