Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1d6de9c793a85dc…

MALICIOUS

PDF

90.9 KB Created: 2021-06-30 16:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 2471ef9d413fc6fe0bf31777342014d5 SHA-1: 771b29b4f69051214a1597a0bd3cfd3e82668ff7 SHA-256: a1d6de9c793a85dc04aa7d5f148c00d5f0ba968dda248a5d8aa7420cec25bddd
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous compromised WordPress sites, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://crisismobile.com/ckfinder/userfiles/files/44573773365.pdf In PDF document text
    • http://businessvaluationapp.com//fck_files/file/49950631159.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/a080a8f5486646c4f822e3a59d4cf148/pebegafefosefawukulirexo.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/2dbef034e187260eb86a0ddb2d4285eb/gikiwotu.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/n1sne86q5t94if42hct4t7npos/sewibetovejebume.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1609885e923963---44241581152.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/96988017974.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160864da58afd2---40254610905.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98063606422.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/woluruxaravebewuzu.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3067bb74b---firovidukena.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2f4d782ba---walomafu.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16098fa9e029ac---kejofeziwot.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/96697364963.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16083c4747f80b---dokofuxukuxamemivojomemas.pdfIn PDF document text
    • http://hibertek.com/image/files/20210612_034401.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf52f37d51e---74138450050.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/22444152a52a9c00b9dc68d79173de84/80406282533.pdfIn PDF document text
    • http://fittbikese.hu/files/file/31097593108.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/0ccd887bdda22fa520f62a0824db1989/64508932648.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/fem644agust39jeieuundtcg53/5611055032.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/60804355904.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/526845217c12d1417be305f83e504ff2/wajola.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/771sat5kctdu4b5clnvlvmhs2v/fabetuk.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0e95be042---podaperiwumulububodewumoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=punchline+of+companies+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10036 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001184d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184D 10788 bytes
SHA-256: b5873cbf86dc1b51676b795a96f38185f147b669d9061d528fe1149be6e243e2
font_02_sfnt_off000130e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E1 17380 bytes
SHA-256: e3512157426f59acd27e91d217a8bb32f1f45b203f586de1e6a446a9214bcb26