Malicious PDF — malware analysis report

Static analysis result for SHA-256 af5af106ca9ab948…

MALICIOUS

PDF

91.6 KB Created: 2021-09-10 15:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c474ff2d2014112ec05b4ae23a9ccb93 SHA-1: baead8702242d45e26d58cfafb84c6bd4d3976f8 SHA-256: af5af106ca9ab948fddfdb3d3dd94b2118b5a35dc4041b486b12d69f3e16ca46
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple URLs, several 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, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://platcometals.com/images/file/69615019705.pdf In PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/xotulewuwow.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/33738438809.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/97791489483.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/34118650260.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/53241488948.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/ba766e7ebca6d2beb509aaef0f303daf/kimawix.pdfIn PDF document text
    • http://origo.ws/userfiles/file/74803991546.pdfIn PDF document text
    • http://koddous.com/userfiles/file/mupenesalip.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/92165517387.pdfIn PDF document text
    • http://bekescsaba.varosom.hu/userfiles/files/sewavesodugegima.pdfIn PDF document text
    • http://bulmarconsult.com/files/53307037393.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ff925c610---84516670647.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/98194077474.pdfIn PDF document text
    • http://jgweld18.com/UploadFile/file/20210910083133106.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/54529040206.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/67540682116.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613292cf248bb---83894007269.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/46125247273.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/161613393.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109021322317332.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/82866658135.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161346993a4245---nipoduwefasalizeb.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f01af10ec4---46172235963.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=best+launchers+for+android+tvPDF 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_off0000fec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC3 18764 bytes
SHA-256: 0e33a8f10655ccb6ffbf6e362dd29adf17734172b3d4bdf044215695ec73593e
font_01_sfnt_off00012fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000147f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147F9 10792 bytes
SHA-256: 8683ca0a160c88176a969262b14c09f15c8b0afbbd908ba67d2f04c0683d0ffb

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