Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e391ec063dcff5a…

MALICIOUS

PDF

87.7 KB Created: 2021-07-01 14:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 49c35dea2cef21f32c42141cd088800b SHA-1: f1106f6ce3d992b769727875e904aaab604bfd37 SHA-256: 5e391ec063dcff5a2d51805100392dc6c042b6528bc26ef688cc2945f1c302b3
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for phishing or malware. The embedded URLs suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842d0b98734---81044475291.pdf
    • http://1960ihs.com/clients/e/e0/e0b58928a48036c9af8d6cfc9cffdd99/File/7142676465.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2b8e020f1---jegos.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/t1lc0s2vqkeqq3phltaihd0t51/fisurabojusapab.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b79a4c09f84---jurunibavukibolu.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/3da14d438a0e947b12c505b623cff991/20212329022.pdf
    • http://local-minicab.com/survey/userfiles/files/malegodo.pdf
    • https://parokisantolukas.org/Uploads/userfiles/files/48846530865.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607adfc2c268b---nopozepakarimubutinanewus.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/359629a5f12322d601ab139b3d777da6/85698542957.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a65a864b102---50118323054.pdf
    • http://velocimapper.com//webfiles/file/61515557535.pdf
    • http://effektfilm.de/files/file/zivujebobilolegexifaj.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f04885fca1---jopojowirefulibogap.pdf
    • http://boxerdapolenta.com/cmsimple/images/file/xisizedusojabavutiwatopi.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/8fa2dc7217ed9a893eb03bdc153e00e7/zozetavavonisulisegotil.pdf
    • http://www.fk-fudosan.net/app/webroot/img/userfiles/files/papone.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883d252c80e---rewafategeb.pdf
    • https://celebicatering.com/upload/ckfinder/files/vurotegerisurubuxiwutopa.pdf
    • https://abicecream.ru/ckfinder/userfiles/files/xitojulojurudosewuneke.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a001f912331---xiribojifuj.pdf
    • http://focostrade.com/files/20210620100405.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=ct+scan+of+heart
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6eb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EB 16792 bytes
font_01_sfnt_off00010efd.bin
476259bd89dca978c46b670ad1a5da770c0ad1f5f8535fb91297cc78e2f039bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFD 16860 bytes
font_02_sfnt_off00013ad7.bin
d88de582250005a3f494c9bb9d59eb0bfc2fd485631da2dd3634f37c2299d008
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD7 10324 bytes