Malicious PDF — malware analysis report

Static analysis result for SHA-256 98eaf297fbe67ba0…

MALICIOUS

PDF

97.9 KB Created: 2021-07-07 12:24:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e98c9521d38207626e0fa75710c800d SHA-1: bcd84ee1fbb5ca3c8b4aca20dbda56cbbc9f58e3 SHA-256: 98eaf297fbe67ba0d8b341f40d70fd5e26f6fa4adfd09003b482b5ed7354be61
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The PDF contains a large number of links to various websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to lure victims. The presence of a security bypass instruction further indicates malicious intent. While no scripts were explicitly extracted, the structure and heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/270fb888d2b56aa582aa63813ea4b0eb/43543870977.pdf
    • http://alituncer.com/userfiles/file/35483497799.pdf
    • http://eperon-kochersberg.com/img_db/xijuta.pdf
    • https://smilaxlabs.com/userfiles/files/kebabawat.pdf
    • https://ludifrance.fr/userfiles/file/99581441976.pdf
    • https://edmaker.site/wp-content/plugins/super-forms/uploads/php/files/bbaaa951e280decb374d39bb36cb19bb/94210056765.pdf
    • http://agendatourvietnam.com/hinhanh/file/18512776441.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770e9e342fd---22173935180.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/a8ec385a25ddcbf135295e508ec0d0de/41334962631.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/f7im8r0gt3rr2o8d86aem93ehe/61410365496.pdf
    • http://urduhadith.org/survey/userfiles/files/dunorunorijosigijatu.pdf
    • https://istanbulbalbir.com/upload/ckfinder/files/kuxoguzixitekiludu.pdf
    • https://anthonygillant.com/userfiles/file/nixigekavafumikezixora.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076f5d7d3fdf---mizox.pdf
    • http://ellerbeefamilyreunion.com/clients/874543/File/31287757031.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094b024814ca---saromudafoxegodudeleru.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/956noc2dvef1630lnpcl1rh224/72344814988.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ff2e27c4c---dufavifamiv.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5978313982---dotebipoduw.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b40860e6c09---pipesudiropanivoniniwi.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083dc22d74bc---xilivonupekanibuwobem.pdf
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/11287743914.pdf
    • http://dgjst.com/upfile/file/sutijaw.pdf
    • http://beautifulmoda.com/userfiles/files/fulenitufupo.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16088a9814dbb9---vikafukibonibuzomijutego.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6485cede51---xugusi.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16086e35fa3c3d---mamifasozefeposixovego.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=senior+software+engineer+interview+questions+and+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001197d.bin
05cffb731b6c2cd1366529c913f9595d5eaa0d0b61573abc55e00a224421112a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1197D 17980 bytes
font_01_sfnt_off0001485c.bin
5907e173cfe97ce2bd9b7c206cc71144261fcaa2a5a9a0fe026832e43c4eed62
pdf-font-stream PDF embedded font (sfnt) at offset 0x1485C 10956 bytes
font_02_sfnt_off0001617a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1617A 16792 bytes