Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c95bc8054c0c376…

MALICIOUS

PDF

80.5 KB Created: 2021-09-17 23:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 475cd7a0b26f2275b0867d458036b917 SHA-1: a5c02ce44fa11c600b329ee6191a715228744221 SHA-256: 5c95bc8054c0c3765e1599e357725d1b0efcd65daffd87217abd79fd85014ab2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, primarily through its extensive use of link farms pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=mi+box+4k+bluetooth+version PDF link annotation
    • http://janjoling.com/public/ckfinder/userfiles/files/luxatarekawixesiwaf.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/fumuseku.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613810b0aeab8---84537486153.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/r0cg7dkp6k9ccbfjulph1nmvh0/jazosilofupukotazuxi.pdfIn PDF document text
    • https://profm.hu/files/file/15474994590.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/badiluxolalikepe.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/62851188654.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/nogizaniwetunib.pdfIn PDF document text
    • http://slsnn.ru/content/files/kivazewavomugevolerixikis.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/41976620248.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/75280283058.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/161336f1aa8d98---43062029012.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/72869358488.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/54105690163.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/32524363156.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/ebce41bea9149ca58a832bbe68796151/56645789645.pdfIn PDF document text
    • http://humanlitech.com/files/files/bumafakirobifer.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161303de8159b0---48148921950.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/dekoverikumozage.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/31310198904.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/69623304179.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/51667070014.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/nonuxuvudenapasirav.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/87067118575.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_off0000cd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4B 10616 bytes
SHA-256: ed70bfaf5a0f78c09a6c545b6e8d64a82f7283b8d11704cfa90acb679d74961f
font_01_sfnt_off0000e59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAE 21916 bytes
SHA-256: bf9760a3426ea7be8de9b03bafd0f7b16833e8644b9f5d2fb2cea1b7a2847e86

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