Malicious PDF — malware analysis report

Static analysis result for SHA-256 98a40ca34adba2a1…

MALICIOUS

PDF

193.4 KB Created: 2021-08-09 07:33:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c70f0c219fa29c0c2335c0f965d9c414 SHA-1: c5a808eb4b0e5152076f4b82b04f104d3d044d81 SHA-256: 98a40ca34adba2a155b6e3fc73e4df6b3617c8ffaa5105e1ce68880f0110228e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://firewheels.pe/userfiles/file/30902642557.pdf In PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/76qljof1u649ngdo5seghmj0f1/tulozarax.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/031038433153.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/07fa7898f937f339c5ad8c852d46dbd5/55103747375.pdfIn PDF document text
    • https://angkagenap.com/contents//files/rosuvujagot.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/t32t882c709mvmg71psc6rt419/kawopazes.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/c2bfcbf4951e8d43cf08164a04c7f09b/11403547396.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21261a5397---lagezupex.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/44a70b6a235daf4292bd08a9ab22fb61/41728242596.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cd746111da7---xurasuraruwiropilipulo.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/f6e514fecdf88d6f8fee2f4a15177948/11371884171.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/68853619152.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/njpcoigs7birv8glocuioertrq/28501319419.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/mamovomebomasamulivolupa.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607546b7d61ac---63042272186.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/1cb8c1d6deaa078840c07a80ac6dd2fe/15440671445.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/63355924174.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/dl9pu56qvvv0edvd1teff2fvev/zikawatumer.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/nevoxunipudibunozulom.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/715c6b9c8d9ffb69b1ec44d04387abf8/82893408311.pdfIn PDF document text
    • http://amandamaitland.com/images/file/sunitiwepodupoxorafa.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/poxuguwogavutukonekisizog.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608657574bfd5---kuranuvinozaguzifulu.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/jegaka1d6ea23vb4cu3i1mfitk/tabipa.pdfIn PDF document text
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/vavuluvofugusat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=pokemon+go+hack+apk+2020+iosPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00028044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28044 3712 bytes
SHA-256: 51e332a908a4643e88a31168b687bb764aa8f1c814b1078b0ec82ecaf9674864
font_01_sfnt_off00028f0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28F0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002a723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A723 10912 bytes
SHA-256: 17d63b0ad8f8253c6dc07753b65516b3527a40cdbfaab999621793b6cbe8656d
font_03_sfnt_off0002c044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C044 21440 bytes
SHA-256: 8de3c4f14bcb63978da26a06172b1a743dd23cfa9e30cfc824a875de921c64f3

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