Malicious PDF — malware analysis report

Static analysis result for SHA-256 98cf8234e8f6b34f…

MALICIOUS

PDF

74.9 KB Created: 2021-09-04 23:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8a4a3251a8fb53d91a5c07151431c076 SHA-1: 3fb6137b4b062e7a1cbb13dba6bef1bcd3019cdd SHA-256: 98cf8234e8f6b34f983fa17e87d7adb68af3f6edd2fda54b840c0b85e50bfc05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, likely intended to lure users into downloading further malicious content or engaging in phishing activities. The presence of embedded URLs and the nature of the heuristics suggest an attempt to disguise malicious links within seemingly legitimate document structures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://catamma.ru/uplcv?utm_term=low+fodmap+diet+stanford+pdf PDF link annotation
    • http://7onseventh.org/clients/868256/File/79903439870.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/1262497eab94cac8887115050730b8cc/zosoj.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/f75b09a371e48025169d8fcec125eaef/25718815914.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16fe88129c---94238341399.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6389f1c47---widajozadoxuju.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/bawarefebewiziripol.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/6iibc2bu9nsedh93j2l803dqte/72333449941.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/85303851656.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/lajinome.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/535a5b23b2dc631584402e8404c48d03/29777655235.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48a92ad1bc---bulekolevix.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/b706167299d6930c0d69747753c81047/zanusizetolusowitonuwir.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/rufalesevixonogozarotado.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/0f2008ee03d2411d903a74a1ec2f054d/lutezagatudef.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/pafuwowizi.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/tabefiworin.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/a119199b10a0511499cee4164443013e/xenapisu.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/47074203329.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/46671949821.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae908c807da---95764636277.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/447f9bd53f91e3eb53735d7330e8ce0d/wepubijarivowul.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/67479037153.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b991238fc---17857629233.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210828_062603.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_off0000c267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC267 16660 bytes
SHA-256: 8810121d6f2c624f8a58a69622a09493874938ecd839d44dbb738e30f3408711
font_01_sfnt_off0000ed33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED33 10656 bytes
SHA-256: e4cb46507e6887c26cd6c7f63067891311fb226dd014373db65276bc495d892f
font_02_sfnt_off000105a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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