Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4f55c1b20363156…

MALICIOUS

PDF

85.1 KB Created: 2021-09-03 03:16:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e40b3587cbb67448179a476957998f1c SHA-1: 648b17dd1a1b3bdd2d20a23b6a1d91c774946be4 SHA-256: c4f55c1b20363156a871810e28ba98099ad3b5ed329a78d07578fdcfae510a77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

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://huntic.ru/uplcv?utm_term=internship+report+pdf+file PDF link annotation
    • http://fisioterapiasuzzara.it/userfiles/files/wobobaxaguwijofukufadime.pdfIn PDF document text
    • http://zigzagontwerp.nl/sites/default/files/file/29676777427.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/pobaxagifakev.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/ff8bf082ebac2142e4db4131fc0d5975/vanewo.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b37d7adebb---vusewe.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a5168cdedea---vimawisinelonupojuwuf.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021080107053773499.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/0106b60ec5fce3f1b36625b0eae3713a/fivosatufasifibo.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf6de6727ad---81952012186.pdfIn PDF document text
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/14bb5c6e5a69fa62239384f618f9ffcd/53313002481.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f500fd58---dagebeton.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/zekizuvedapo.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/14738413233.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/33440411161.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/46863543452.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/52356147356.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/zotekaromejev.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/37939749225.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/1370500123.pdfIn PDF document text
    • http://intersonik.eu/upload/files/darifunatejefokede.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9ce86b4f4---12771961889.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c99382bd704---lagedoju.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/zujakuniwefalub.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/59807373535.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/58606620090.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_off0000e6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED6 10384 bytes
SHA-256: 3a66c8613ef397d3d6b4e47d1d61799cc3e069434d086c27a498ffbcfdc819aa
font_02_sfnt_off0001162c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162C 18856 bytes
SHA-256: 60a5fca867b8b5fcda5e4f43ef5bf5860805cd1f17c58b783b4ac76d77ba5307

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