Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d03c8f777e6da82…

MALICIOUS

PDF

164.4 KB Created: 2021-06-26 23:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4e8bbebbaa7a627f569756e7f8331257 SHA-1: cc428688acb007d0b30e1a8d71cc7165a3b9a602 SHA-256: 7d03c8f777e6da825c6daeedb4307572b79961d302d46f8468bc96a566aeacc1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics indicate it functions as a link farm, directing users to compromised CMS upload storage and potentially disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure and URL patterns are consistent with social engineering lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9741

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://cungcapluonech.com/upload/files/44312946139.pdf In PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16082a6b3188a9---gozefifa.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/raporadosa.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/a29fa54211fdd46f350a180a42f14807/litovazexilojuziviwak.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210530072837.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3665ada897---wuridelujegakifireri.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1077023365---71780964848.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/n3trf9djdcvohb3in3cnp73mdu/98316100541.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609671ab830d5---dikofitakezunowitonaki.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/d8d8efef44feeb010d0982d7ade26313/wosisatafafezogi.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0ec597361---ganilurepofozibalidigimi.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/35218816668.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a000772d976---73333848017.pdfIn PDF document text
    • https://zhansq.cn/upload/file/xusibixonidimomad.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/qiev6fhonuv603q7rsir2lstp6/parupuwox.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/xawafek.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/91cv836529dde04h2luutvklb0/nopovewef.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/75372055459.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a96e001d0c8---35030517529.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/56654c4f944fd2e2a8eec6de99b3c627/wesebizetojig.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210621084701_75uk96.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a70081ae6c0---45651214081.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/ff189a5a32d176188ea9c5d4d3402cc5/69230574953.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/jgincl3tr63aq1vblm9qj3ucbt/78052942606.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/ruwakivuxuzape.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec5126e286---76822735677.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=typography+books+pdf+free+downloadPDF 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_off000221b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x221B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000239ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x239CE 10980 bytes
SHA-256: 6f0123d1d95df9d0761210c3196d30a081b812845e362b969969d2c31db19658
font_02_sfnt_off000252e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x252E5 18592 bytes
SHA-256: 31c01d942e6b89b206d30b6ef9d96e0255f04d162ddd7e085a387ad3c1345001