Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9744a203a5a5556…

MALICIOUS

PDF

76.0 KB Created: 2021-09-19 06:12:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 610fc71f9f68a6dd53b2a011d2388922 SHA-1: f637552a66a2a534aad9dd3fccaa40ec58edd1c1 SHA-256: a9744a203a5a5556806df90ad7433cd89b4d6eb88e86564945de77b373605342
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure suggests a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://wastran.ru/uplcv?utm_term=phone+emulator+for+windows+10 PDF link annotation
    • http://gkz-crimea.ru/userfiles/file/dimuzumu.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/favidujidepi.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/fuvogigilaxezevezipudub.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/losipafopesiwewomuset.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/lowusiv.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/peguvo.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/jabokasegarutivupibugune.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/79396123594.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/fifaz.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/lozofubulizuw.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a66b54fe8---74101629980.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/9c8c261da4a5bdd357c228a0001cbd34/dafabunas.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/30628226259.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/foperezimoxut.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161318fd0c5842---55706430665.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/tabijoparetisadere.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/1983626840.pdfIn PDF document text
    • https://tessuno.com/upload/files/6136c1b675944.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/sagatovodesurakedaxo.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/godowekawamuzofigiz.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/jtotcm3tcsf81l6c1k4p6vpfs2/nejaxazinoxekujusovuj.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/44127728387.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/datajizomogabekov.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_off0000c3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0B 17216 bytes
SHA-256: 3a110c0029291056991ca8b8b809a06300208c5bb0b961a8eec8ac39bad30da0
font_02_sfnt_off000108f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F3 10980 bytes
SHA-256: 5990df6d683921fe371fe57d149cd195e6f4f916f32cd8fb8d45e6538d2ce320