Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e788dac99be55a9…

MALICIOUS

PDF

89.6 KB Created: 2021-08-10 07:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b3dc0b11611ebbaec33613d1eac1cd39 SHA-1: e1c1208b82b4550193658b8620e64fd1022dbfbe SHA-256: 1e788dac99be55a96cd9b25772fe7f4ba26d702715612bc7f78e7bd095635d31
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to compromised WordPress sites and others to disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://abwessex.com/uploads/files/4225132809.pdf In PDF document text
    • http://thingsantiquesla.com/userfiles/files/88467996586.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fdb52123e30---fepanafof.pdfIn PDF document text
    • http://fitviewer.de/files/file/muxavepopidanobudes.pdfIn PDF document text
    • https://sca-kc.com/scauserfiles/files/14331410595.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/53034382734.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/daxilojalipepu.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/67e186227c157739b71a346817458957/48684100271.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609be533d44c3---sawijanakoxisojusuguwe.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/maribobotifugifesilul.pdfIn PDF document text
    • https://jagamimpi.info/contents//files/jeduwetedavagana.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021060501592573499.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/67317448753.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f79e696c898---jukivutiwodatadojununesej.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860c7d010b4---jatavisafodese.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae0e2649e8---63808571628.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/80027105482.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/nisorejuvajakebodunot.pdfIn PDF document text
    • http://cuatudongnhatrang.com/uploads/files/tigifazobudutipoxow.pdfIn PDF document text
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/tikazanujutipolimetefe.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021062422484192.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16104025bb7986---lelibepiwogivajidurevemu.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/virunubivagesomu.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/94001946479.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/96523655180.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+unlock+all+build+items+in+sims+4+ps4PDF 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_off0000fa8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8F 11064 bytes
SHA-256: d4f5e25e9e1207e28025fa9cd1cf8dc57b6b7ac68751fa4b11e937e261674507
font_01_sfnt_off0001142b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3D 16440 bytes
SHA-256: 0cc2bbd4be09afc3971dd60cdbc236eddb50a21f1bcc31838e3c7a10110af19b