Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3779cc2666c3ca3…

MALICIOUS

PDF

72.9 KB Created: 2021-09-15 20:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 081d9027d4d40e5a8deae9f42e386b30 SHA-1: cc9e4c056bf7d1fc32c03cb41aacbf320a44218e SHA-256: d3779cc2666c3ca32cda5bcd0b0e7872d5fbac992868f9706c8406dddb9e3e55
176 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URIs pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of raw IP address links further supports this.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://pixomot.ru/uplcv?utm_term=android+block+number+from+text PDF link annotation
    • http://theheavent.com/userfiles/files/minidugo.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/fiwepiberof.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/xazuwuvamedafejifalu.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/koleredagixudogutoma.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/10530082294.pdfIn PDF document text
    • https://norservis.cz/files/files/6373769132.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/xivogaladagujes.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/75034501027.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/11276278765.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/79911653087.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/29351227712.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/37357362898.pdfIn PDF document text
    • http://kidzcastleschool.com/singhania/downloads/file/56568590619.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/bonosakanasafizewixawo.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/ed825e33a9e1f09cbe400768f6443bb0/75961854957.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/41759503128.pdfPDF link annotation
    • http://iknow.pl/files/file/lerujutejejuwatevufem.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/as8v5ocaff98k1jlb1jhvann4j/disuwezefat.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/xazitekiviv.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/601759b5ebb2b904a5a9d5c500ed94f0/15533116935.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a056fd7583---darose.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/39468497738.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/xirazewanapiwomavu.pdfIn PDF document text
    • 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_off0000b978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB978 10724 bytes
SHA-256: f7ad91e33ab8044cc176aa736d7abed05bdd3b86539a2e79f8162921f230458a
font_01_sfnt_off0000d214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD214 17332 bytes
SHA-256: b7065449927a4a5966e3f99befbacc2055b5062c60526df8dde814b08a94771c
font_02_sfnt_off0000fe7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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