Malicious PDF — malware analysis report

Static analysis result for SHA-256 f186b2aa89a00793…

MALICIOUS

PDF

83.0 KB Created: 2021-09-07 22:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: f3525d0622c86170fa0fc683ff6c0d36 SHA-1: fa377e165a93efc186f09d4780e0a38655b53758 SHA-256: f186b2aa89a007936566466705446e615dcd911edcd2793aa41de89113ab34f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1607d560a94c4f---59949490802.pdf In PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b154a02ffd---zafomuzixasupupaf.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/jixatepigotovamula.pdfIn PDF document text
    • http://omni-links-europe.com/gikebemifan.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/fiwebitegepo.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/a06ec5d73f9c832b1df481e0399e644d/bapafezobigipumokes.pdfIn PDF document text
    • https://podimercrm.com/img/files/6171041443.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16086fa95c5edf---69480635553.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/da916bd12e4306ceff2c0551f315e0a4/webak.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/mopizigawunutametebupoxiz.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/9mvmkmajc165p4ap484tqgrks61456pa/28444647056.pdfIn PDF document text
    • http://kokalietudarbnica.lv/files/files/nebusogelibupiro.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/mubukul.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/6c8abedbef71db40e46cfb3760206577/28418240326.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ac93535b23b---64341561196.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021052514335489.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/dojupibowuwunelovokotu.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109030558306622.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/nalob.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/7571458d07d3ba83d9540a216a14d09d/39287244218.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202108282118342773.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/9fec8da584debebb5915546978102808/geluxokubot.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/sovokasoxixaludenikifix.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/07e2cc4dfbf0b183dcb12f0a1a3bb830/metedenixulavesawiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=functions+of+accounting+information+system+pdfPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88B 11108 bytes
SHA-256: 154115cd91c5280f99f6c4dbadedb2c6679a1a3f0b4f8e5de4c606bb52322435
font_01_sfnt_off0000f247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF247 2132 bytes
SHA-256: 8ad1629d78958631526aea0a74d0b163a5252944052d54f78beed5240939c1a1
font_02_sfnt_off0000fbea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEA 16124 bytes
SHA-256: f194f02fd815a13bf58017b7881349919d8c2970c9e623e6f956959a6cc33dd0
font_03_sfnt_off00012531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12531 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1