Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4e0efe55a84be31…

MALICIOUS

PDF

70.0 KB Created: 2021-09-23 06:32:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0d62e25435944f116947d49204d31da8 SHA-1: 62c6f7e3681bff7dfca58d556d4b0466b6f9634b SHA-256: f4e0efe55a84be317e7bcbf4d96c193411003c47ced7fb3c4a5f650b411012d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious link farm designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://ketchas.ru/uplcv?utm_term=profoundly+coins+hack PDF link annotation
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/74dfb9bbf6bab22db081483ee9fa6c9f/duvofubazawozilezowozosuv.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/zabikidarajixobuwa.pdfIn PDF document text
    • http://kelt.pl/userfiles/file/80407412154.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/tepimiperunimi.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/gt73trdd9vv7u1gid3hb5slrd3/68427277614.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/jibavokudigezenenim.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/ced93872a231bb3d08eab12104c8711c/fepiloxazo.pdfIn PDF document text
    • http://jawarakreasi.com/file/pedadewe.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/96371259153.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/15201975486.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///jevidig.pdfIn PDF document text
    • https://dcicz.org/userfiles/file/maleperapubediteziw.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16132a2ffd2325---wusawivus.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/ramunovugosikafokab.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/11053761298.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/romuxifikigisaxoxaxuwose.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/76733775430.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/wogalakibuzegami.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/43a231404fdd598bb1627037dd4d33f4/89007061081.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/mepamuzumiwefabaxatexavo.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/75050350720.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/jolemonateburulisolef.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/jasodavuxuxuwironok.pdfIn PDF document text
    • 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_off0000b448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB448 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5F 10648 bytes
SHA-256: da89e9269a866ca74fe995949f83b14068c73776d7e8764056f3a64c0c336aec
font_02_sfnt_off0000e4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AA 15096 bytes
SHA-256: 68fe0e2aa66e6fbf61778fc560ccb1d528acc3dd82d51996696d46f9753d67ed

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