Malicious PDF — malware analysis report

Static analysis result for SHA-256 49319afc059d7642…

MALICIOUS

PDF

80.4 KB Created: 2021-09-02 20:32:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8157aac2e4414e7dc1b4117f9b114e69 SHA-1: 4b0822384a646266d40f10cfe39dd137e84b0a0b SHA-256: 49319afc059d76427ffb03ad02c66529a22a33cc804c94cdb0aa91d89744a688
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to manipulate search engine results or direct users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://bwc.lt/i/pomibekudikuj.pdf In PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb5b422a9e---soxawupivosekijumivifud.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25310931799.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d86915b081---75635752595.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea713ef95c---7068967092.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/60a449ce923ff3eadced80fef80efc52/kalugomejasijagem.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/komoxusinotuvenebisokafus.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/situjasonovupuwegikinusa.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210817070035.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/sojanij.pdfIn PDF document text
    • https://ovth.ch/userfiles/files/51587198877.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/jatetivixoxifuleki.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/05/12/file/20210512_233512_125.pdfIn PDF document text
    • http://taumed.kz/upload/2021/08files/210815055949652320ym79r.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/1107315232.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202107012004.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/rawaduzonakagewofaweluki.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/64399035775.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/monogerovugakezawuze.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f3d2b7b687---vukunitixanusixotu.pdfIn PDF document text
    • https://etimes.mn/uploads/files/28769628694.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/65322117743.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/7aoj8g2d55f808b28hljl5uk90/letagide.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=biceps+tendonitis+exercise+pdfPDF 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_off0000d6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BA 17712 bytes
SHA-256: 3aec947ca9925f452a707e0fef18f6d08e2f976b4ec16fc8097994b59c06fbe8
font_01_sfnt_off000103eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EB 10560 bytes
SHA-256: 11fbbc61e3f095399a262fc86dff6943a06c8b88bb944e1be4cd31ee4abcb08a
font_02_sfnt_off00011c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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