Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f37aa3ef832ac3d…

MALICIOUS

PDF

76.0 KB Created: 2021-09-08 07:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 29e3862a2f8d6866ee13faae913fbe91 SHA-1: d17c3e8fb6e4781bd3f3417d8605f22b6b6ff7c3 SHA-256: 4f37aa3ef832ac3d61d23753ad489f3da0a795baa9bc4291f53b1d52926cb462
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to PDFs hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to potentially malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the final destination and leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://hoteldanang.vn/uploads/images/files/ridakir.pdf In PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/luxenulole.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/dc219e986ce10340102b9c1ae3073a22/56170575482.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9d9133d2c---58747135921.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/zeduguboxusegejuroxe.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/33592496972.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/70746862089.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/93268590413.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c13ede75220---wututosobilivowukof.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/713687b63559abcaab7e3a9c74b6d81f/xozelawomediwanazefiguze.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/gubonurobiva.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/taperutuvagixojikagulis.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b012b62759---webatavot.pdfIn PDF document text
    • http://industrialdevices.in/uploads/dutifovogekisej.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f140d96223---60811149031.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/c293f0fd84a9431f0239467740a36e51/notoviteritojasudo.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/lipamexi.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/467722cb5e88c72f6b9b178e6b6c1880/marezop.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16085b689dad81---gezajejemomif.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4941dbec0---68475875994.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b6e217426---xawujiguneneso.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfafa511227---siwitewetemadevesazelovok.pdfIn PDF document text
    • http://flomojapan.com/upload/files/nukumiteg.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/79109084116.pdfIn PDF document text
    • https://hirurgija.me//files/51116787702.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908b668b788---22278212546.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=straw+bale+house+plans+pdfPDF 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_off0000c6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F0 10904 bytes
SHA-256: 4b408ebc7f119384c6dc81a4a840dddab870012dcc5a4dc5c5db3cc9e2e9b6c9
font_01_sfnt_off0000dff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF806 16860 bytes
SHA-256: b0a1b61fc186fb10784cefc9a1f8cd52c68269ff18f37e5db8b088752680b694

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