Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7da8ea76cbb085f…

MALICIOUS

PDF

81.5 KB Created: 2021-09-10 10:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bb6956d08bc96f7663cfb89bb1d987b8 SHA-1: 0f64e4da0064de8ad62be58736b929b30ee8d327 SHA-256: f7da8ea76cbb085f7308712b934aeaddce52b70f9e096d2ab2c541eec3b7fc44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://cructi.ru/uplcv?utm_term=minecraft+pokemon+building+ideas PDF link annotation
    • http://www.pattyn360.com/upload/forum/files/basakizefemogez.pdfIn PDF document text
    • http://askaudit.ru/price/gigolexafuribiredamilud.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/4344768275.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/wowujuwowene.pdfIn PDF document text
    • http://bamor.org/userfiles/file/wufemogepilupemonavegapen.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/1cb91f0d3ad087985cfa9a079ae260b8/sefoduwoga.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/sexefijozapuwegagolo.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/migetogezafun.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/8p17caet3554d53pd5f6duv7gd/27004467930.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/jb700i0etnjjotdjc1mpfsdrm1/fasolitukasir.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/ligujoxakedetam.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/runerisejanaliv.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/guwed.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/nizibidibinixafelevufe.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373bdb49310---dixukuwiruxezikosixes.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/xitefogitaxikisusame.pdfIn PDF document text
    • http://canyonmeadows.org/userimages/vexutinadalenad.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/34329773588.pdfIn PDF document text
    • https://dm288.com/slicice/file/dexaxijug.pdfIn PDF document text
    • http://friulanamarmi.it/images/file/81865395418.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613381279d828---81803482572.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/14713320724.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_off0000d67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67F 11288 bytes
SHA-256: 84f43f060c0ad8bcfc1b1d1ebef8d5a5a35116f8e2af8bf9828ac5d5ae03c25e
font_01_sfnt_off0000f08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08D 18636 bytes
SHA-256: 1f28b6dbf71925953dadfa4b912dd5d607318a0ae39ba7cea8f27a1943e50e92
font_02_sfnt_off000120cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1