Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ca991601c1e3305…

MALICIOUS

PDF

76.2 KB Created: 2021-08-28 04:25:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c15eb05dec982ede53302fbb5212ce8c SHA-1: 9d2917c55a4745a7d373e908cd9a9dd35da2454b SHA-256: 1ca991601c1e33051283aa6915ca905896e3a0c7869b1400ed3f72f14fc200a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host and distribute malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16113e22e21a0e---xavufiju.pdf In PDF document text
    • http://moreit.ch/productinfo/file/jefogemepixinava.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9613ce8e18---manizenurerusavalolepib.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210816140333.pdfIn PDF document text
    • https://theurbanthinktank.com/files/zobineruwodozubeb.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/xokotudolagulafiwad.pdfIn PDF document text
    • http://solucionesinmobiliariasavg.com/ckfinder/userfiles/files/14809378654.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/632vae4m3ijt3mke2l36vah6r5/goxafa.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/53074060316.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98cbeb17fa---sozixasuzime.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/66071182674.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/19626011652.pdfIn PDF document text
    • https://carlojans.com/cms/file/lobavuvipivuxikomelifas.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/6e8lpjffsm24i62i8keekj5td7/87303217665.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920e727afb7---lunaperetakijimosolajaju.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/pudigapaxufu.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/58289718227.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/kumotanenijibotefubigo.pdfIn PDF document text
    • http://topas.lt/userfiles/file/dusewarad.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3493caf26e---ripekawuzunixoxav.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/mpjna5q50l2acd556q4k7op4m7/85522859927.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/bq84altsgmgpcdmlovs4vrkjv4/89477675910.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/fuvugefuzolape.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210512215955.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=samsung+ds+5014s+user+manualPDF 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_off0000c503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC503 17004 bytes
SHA-256: 1a4e2b4691ef960c5902285ed651e365cdc0fb5d93708aaedcb1ab9d20b6c655
font_01_sfnt_off0000f11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11E 10840 bytes
SHA-256: 7bf36d8ef582628284cb78f234edc187b699abc2029d686ec7e2ae6b00e0a435
font_02_sfnt_off00010a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1