Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d48227368fefff3…

MALICIOUS

PDF

83.3 KB Created: 2021-09-17 13:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 91ec539a8d28a6b45f9a2b5e50cab417 SHA-1: c0b1fa35f5fdaceca47d64385c022483c231b80d SHA-256: 3d48227368fefff330ad22b2b050f10aa45c117617a2a6f98548f3404387c591
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised websites, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and a link farm heuristic suggests the document's primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16140936e61098---mivajifelitide.pdf In PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90691899552.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/54516728940.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/49576106895.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/pewulazebibukarituxovaxeg.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138c1ca119d4---nifowow.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/7424046819.pdfIn PDF document text
    • http://icaalliance.org/filespath/files/20210906174955.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/lutovugeraxofinobuxomupo.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/lapateku.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161442839a6eba---zafex.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/lonepazuterataja.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/kisanijabokujamovabupug.pdfIn PDF document text
    • http://2222.netsociality.com/upload/files/rotejikapuxirenode.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/10763027475.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/kopuzipuwibeb.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/kuponoxunejorusubo.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/87912270244.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/92962385714.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5cc37f977---talexetilixe.pdfIn PDF document text
    • https://losungversorger.com/product/file/jidamogakazatibodixeme.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/jumoxulotus.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/90385596814.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=problems+with+android+file+transfer+macPDF 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_off0000dd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD60 10968 bytes
SHA-256: 3025ad49b86d5f8476954c1a28fdb11dde110e17b5257365b9c96835035ea5d4
font_01_sfnt_off0000f6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AC 18896 bytes
SHA-256: 68d0dea3c7d3a13470a8ceab678b03d5a42ac8db1e5bec42a4a353a32a4c1639
font_02_sfnt_off00012758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12758 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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