Malicious PDF — malware analysis report

Static analysis result for SHA-256 f89cd34a6db3f556…

MALICIOUS

PDF

84.4 KB Created: 2021-09-06 20:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dc874b23911b6a9c8f86efc8738e4f0f SHA-1: 83b360a0ebd530676bd98eb957470d280283af38 SHA-256: f89cd34a6db3f5568906dd5502c17aaed4712a495ac4e3cae3e09c338e75cd42
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing to multiple URLs, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the heuristic findings and numerous unknown reputation URLs point to a malicious link distribution scheme.

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.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/163bacc5a1f8bd915153f644e893340e/ropon.pdf In PDF document text
    • http://zbirozskepodzamci.cz/userfiles/vagujakowole.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/bamama.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/72410583820.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/3564c2cc20a53ab360610475f847f71b/71635303050.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/wuvazatisosetuk.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/49232442353.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/92967710380.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/tp5khbnabal2u7dqvd0o8k00m9/tonaduluwugigomeporudego.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/84850933953.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/nalazovawubev.pdfIn PDF document text
    • http://ort168.com/upload//ckeditor/files/sereb.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/buxudowowumoxekarup.pdfIn PDF document text
    • https://codecs.roimages/file/gukefaxazolenoredimu.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16081745469b22---nebiteratujimib.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/bozixazabidusakorivu.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/238hi6b8724i9fh2mge9ntumt1/ranewonolabuforage.pdfIn PDF document text
    • http://www.520amis.com/upload/files/vegizalivok.pdfIn PDF document text
    • http://www.trotasierra.com/plugins/ckfinder/userfiles/files/fukaboderapunuza.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/93764820305.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/19588267468.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/3nhamtjb39ni2884eq3lsjeh59/80967374108.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22420800393.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=motivational+christian+books+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_off0000e728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE728 10876 bytes
SHA-256: e9681aa29dd0f7e78f7abd382bb88fbbb48efae2dffa59ead2056eb76b30f98c
font_01_sfnt_off0001000b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000B 17036 bytes
SHA-256: 96d01c3d826067e4b69fda1611701e08b046bab93dbb4e9a580ef11fc95bc8ac
font_02_sfnt_off00012bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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