Malicious PDF — malware analysis report

Static analysis result for SHA-256 6251c7288e2ad918…

MALICIOUS

PDF

81.2 KB Created: 2021-09-07 14:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0c1986f9b49b1c0b218babea2be23bf5 SHA-1: d8a5c026033c20514212d78bbb9a723192ca3fb7 SHA-256: 6251c7288e2ad91802100287a9168d9bcaabd195c0f95a794b2364644d075b57
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of many links to potentially malicious PDFs points to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=gregorio+paltrinieri+libro+pdf PDF link annotation
    • https://santchavarabed.in/ckfinder/userfiles/files/94218764543.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c4539f8e04b---dogalonulavumapitap.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/xuminikivalekudidorer.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/78412918040.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/jawekosuzuje.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/1fecc9ce199cab12c0d1b8ff0916d2ad/wuxibake.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/dobuzivifemapenugikafupot.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/bezexozilobifematow.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/7005010551.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da6715e768---vivivevoguda.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/sivuxipadutikofupate.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/161101bc86e413---33581523459.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/pakavaxufoxejamob.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160892f869db0c---4725199382.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/2b6c816d4b841a245301f2e36889d301/22271728153.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/17517437319.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c66b103c5d---kaxatazikitedelu.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/21853182467.pdfIn PDF document text
    • https://armenia4d.com/contents//files/fufilibabazelebuxuxozadif.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/75658998213.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607127d471852---podozajunekafonobefozaw.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/766f5a6a17506a7b6603379e1147a299/54394485148.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/vuketezota.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160891fcc83f12---45529924579.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_off0000d8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF108 17556 bytes
SHA-256: da198a8f373abe3f0cbfcccb1264ba7caeae82ebf0fd5077d6299799c8f05cc9
font_02_sfnt_off00011eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEF 10684 bytes
SHA-256: a93a623c23b38eb6e51d29ef95401293174930ba94263c145f392f91e792e33e

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