Malicious PDF — malware analysis report

Static analysis result for SHA-256 4481df4c57279290…

MALICIOUS

PDF

91.9 KB Created: 2021-07-23 03:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 87bbb1a31e8a814b0a2226863678fe4c SHA-1: 353ad1588c5386a97a4cc420d468cc3bfa8ac8a2 SHA-256: 4481df4c572792907a541b530afbabc9365b9f1f9d896b858eb91c96063b2aba
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a likely attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, with the URLs likely serving as lures for phishing or malware delivery. No scripts were extracted, but the PDF structure and embedded URIs are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088dd6626744---53239000458.pdf In PDF document text
    • http://originalcheck.it/public/img_admin/file///pojumewinukutadibozazoz.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725b20373ba---rodusugejejiginodepofo.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffd48f4175---21674570564.pdfPDF link annotation
    • http://broadviewlibrary.org/uploaded_bvlib/file/guwujodutukerexulejexer.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16087007b4f736---toletokitog.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac17fc2189b---ronafesifoworapopu.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/72110000672.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/26733d905369a4a17764a468ef8aceb5/wijumotonajeruwudez.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d40a3427180---80181765319.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/belawubuwilaj.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/difipoti.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921532d4cbf---29776324797.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097260d16ab7---josenafedojebijepaterujaz.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/5ji3t9t6lskd1e53eps2vpthdc/pixowolavomisubileboz.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/499ee7b1b8972c7e6aece88477630942/dodozodurulafufevet.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/37267460551.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/66637415483.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a685980a334---67044711219.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/b6e78aadcbb69690e037188ce7a0c107/17888866287.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c54cb9ba39d---80795826602.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/d6b1924d75ef69bb84134f6f076152f9/xavodagoragofi.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/bukugufapemelejiwepana.pdfIn PDF document text
    • https://bio86.net/fichiers/konigexufomavisezenas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=best+caption+for+cloudsPDF 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_off00010250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10250 10764 bytes
SHA-256: 13b08d3493c7f29ec9fc54196a5316be9d31f051d897af1fa231c20cdfd679a0
font_01_sfnt_off00011b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001334e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1334E 17836 bytes
SHA-256: e69d43d02db1f99f5e8c6b327b5d44f10ab24df7e19b59cf7ae434bd77969311

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