Malicious PDF — malware analysis report

Static analysis result for SHA-256 17fa01d93cae19ca…

MALICIOUS

PDF

82.3 KB Created: 2021-09-20 17:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4bd9c04661da977c935e812b02996133 SHA-1: cf9463fef8ea6e0e5b3474a8fa5b7859aab79489 SHA-256: 17fa01d93cae19cabb6e870848aaf5ea0805e044cc3f765e77bda742a63feb47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple external URIs and link farm indicators suggests the document is designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://csc-vietnam.vn/uploads/userfiles/file/kinuwapesinagokelo.pdf In PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/772c6e8ca3b1081b0240907e47a0ba4d/94734867749.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/kikunuw.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/64394692973.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/lubamoja.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/83169540467.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415538c0bf0---guxutowaxokemumedibe.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/pesogikogazafikolivunuxi.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/nowolix.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eac64b9e54---88305992801.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/vedopadup.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141df762e9b7---11814174797.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613492f454be7---19015552415.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/fegaladaxibupowilujuf.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/6876383256132d844d653b.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210907000700.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/lalivejawivuv.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/41835898715.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9978c9803---guviw.pdfIn PDF document text
    • http://pronobile.com/catalog/file/vinesisawitu.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/939b97d65119367ca57aa758ec87e38f/reweranifobeta.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/97886563728.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210918023029.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/wamunununapogerejiwujas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=traffic+rider+game+hack+version+downloadPDF 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_off0000dd69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD69 11032 bytes
SHA-256: 5c3aab9423b9a26ad4c9b958d46c97ae61bfeaea95dc587f2cab78203b20f345
font_01_sfnt_off0000f6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED3 17260 bytes
SHA-256: ac9d69d059f985e6142bd49984cf65bab83d83744674f38976b8f32b0c30f852

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