Malicious PDF — malware analysis report

Static analysis result for SHA-256 f77ae46e48ac188a…

MALICIOUS

PDF

68.9 KB Created: 2021-09-25 13:09:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c78af91602063d46181075258086cb3e SHA-1: 469353c4b5b8ce1864e6b874507c331a72984ec1 SHA-256: f77ae46e48ac188a57a87baed688a096946f9edbb84e891d5d5b356c7162b5ba
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs, many of which point to potentially compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of external URIs and a raw IP address in the PDF structure further supports its role in directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://premiumdrinks.eu/userfiles/pizaxirulelawinuvuwakumuv.pdf In PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/47028253062.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/756b230970e5118d1b41ceadd0f9fc0f/molawixuzaralaziseropu.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/nikija.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/52932619660.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/ladafuve.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/35548655339.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/2655865072.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f3ed3f826---pafatusunagibo.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/5b692c9911bdcbb9dd66537498574e7a/rirewumulidirewekesi.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109151237456862.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/92966934617.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/wekeliri.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/jonevevij.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb6644747c---11514830278.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/75095319205.pdfIn PDF document text
    • https://fobh.net/userfiles/files/16497345109.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/wipozifopitanazusugiwow.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/41596116820.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/veduzozav.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/xalomasejox.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/6490645420.pdfPDF link annotation
    • http://timandlor.com/userfiles/file/suredi.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/vasidamewisibudogomo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=kk+chinese+pokerPDF 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_off0000b013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB013 15608 bytes
SHA-256: 7df7e92534f43a2b23c29c19ee2e40f2ca860cc4cc4ca06b1518738724ca8105
font_01_sfnt_off0000d78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78C 10248 bytes
SHA-256: ee2025cad5c9cbf0e3c0dcecbf2e55b8b6ebba97349590ae5439d41d0ebcfecf
font_02_sfnt_off0000ee81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1