Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0afec319991e009…

MALICIOUS

PDF

84.6 KB Created: 2021-09-02 00:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ba034cd7837b3ae38a7c7dee666d5ad6 SHA-1: 7b0501e9df7d59aa5429ae6ab40ac0fe89b05ee4 SHA-256: c0afec319991e00974b6e5f91d0ac53b593ebd390dfde83f10e540d5c0c1c30a
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF. The presence of a link farm suggests an attempt to distribute malicious content or phish credentials by directing users to various potentially compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/n617o4jsmlulhaneau5asm3f32/zivufugarovomot.pdf In PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/99542727456.pdfIn PDF document text
    • https://ludbaegitim.com/calisma2/files/uploads/42264223414.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/6180374739.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/48087347064.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/16501049980.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077fda2bbb79---kewijafow.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/7519c681456f7ac8886118f4789cc457/9406354684.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/namijofax.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/84079663818.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/76047870111.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da7fe9874c---81430579452.pdfIn PDF document text
    • http://bhs76reunion.com/clients/e/e7/e717e6e8e39ea4daeda922698d41f3c9/File/zidotomubukogap.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/35184802012.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072dc51c3fe5---33659336100.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b60822cda---biwevogije.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/zomuzaxekotenowenofugozep.pdfIn PDF document text
    • https://tavio.ru/files/file/xiwiwemarejepukowulefiv.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/57289811440.pdfIn PDF document text
    • http://bendhorseride.com/userfiles/file/79570417977.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/jopigikezare.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/94356865676.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=can+you+refreeze+ground+chickenPDF link annotation
    • http://www.w3.orgIn 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_off0000ee78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE78 17012 bytes
SHA-256: 3eda4c8120b839eb253d8fc075e9dce0760241ec1bad246da36a1cf7bdedeff4
font_01_sfnt_off00011a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A74 10840 bytes
SHA-256: 3a40685b437b42c4184c5426334025a5626fde5a2bfea6e5305f5c7aef5be637
font_02_sfnt_off0001334c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1334C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1