Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eacfe79d38848ae…

MALICIOUS

PDF

72.3 KB Created: 2021-09-28 17:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b79cd86595b9445ee01237ed7f068a41 SHA-1: c137a904d5e244256762227549d1dd769e36eae9 SHA-256: 9eacfe79d38848aec864effe881fee1fe846e0d5d3889a63db75fac3e37c2a72
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, with several URLs pointing to potentially compromised websites or disposable hosting, likely to redirect users to malicious content. The 'SE_CALLBACK_LURE' heuristic suggests the document's content is designed to trick users into calling a fraudulent phone number, consistent with callback phishing or tech-support scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://mimarkamilozkartal.com/userfiles/files/46645560157.pdf
    • http://choinka4x4.org/cms/files/file/91322159308.pdf
    • https://polaria.cz/images/file/78589804609.pdf
    • http://joy05.com/_UploadFile/Images/file/fifipowanit.pdf
    • http://www.praasia.com/file/files/xomepubozusexabi.pdf
    • http://buyyoutubesubscribers.com/ci/userfiles/files/mubegivupi.pdf
    • https://lostfoundglobal.com/userfiles/file/sevatijemepa.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/uf37p5q7f6pag684hqn6b39625/69165905775.pdf
    • https://niboparis.com/upload/fckeditor/file/1630831772_1.pdf
    • http://scro.ru/pic/file/39041900024.pdf
    • http://dexgerm.com/data/file/userfiles/files/lasubalogizepija.pdf
    • http://karthikeyanjayaram.in/userfiles/file/woxiz.pdf
    • https://claudiodituri.it/uploads/xelizedajefejev.pdf
    • http://artediapharma.com/upload/files/72270062613.pdf
    • http://greece-ex.com/images/blog/file/75541730543.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad670a4af9---wodidipewujokexakifogod.pdf
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/67311200496.pdf
    • http://ahkjt.com/upfile/file/30217329345.pdf
    • http://dream-mebel.com/pic/file/6424616362.pdf
    • http://burattinojatek.hu/userfiles/file/pafubodek.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16143927f27236---gudovebabuwero.pdf
    • http://files.ibiza-ferien.de/file/ludusurapin.pdf
    • http://nextlab-semi.com/files/fckeditor/file/58210333669.pdf
    • https://amthanhanhsangchinhhang.vn/upload/files/24137175137.pdf
    • http://suvagcentr.ru/userfiles/files/sugitulunosabavigapesimu.pdf
    • http://myphamlulanjina.com/upload/files/87083039970.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=instagram+apk+android
    • 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_off0000b7fa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB7FA 16792 bytes
font_01_sfnt_off0000d00c.bin
6fc8d9f6fd0de4f0b995b8eb6d5f894652848e0e72de9bb326f41bd28704d1ec
pdf-font-stream PDF embedded font (sfnt) at offset 0xD00C 17180 bytes
font_02_sfnt_off0000fbb0.bin
65dd296095439eeb1f80ecbae1ba149ffdc2ac0ea66e8ce134ba5c67f613c364
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB0 10600 bytes