Malicious PDF — malware analysis report

Static analysis result for SHA-256 f87611c3f5d1a488…

MALICIOUS

PDF

66.6 KB Created: 2021-09-19 17:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 92649adb02a5daec5cb544ecdb26e3ca SHA-1: accd0cbf6c9ba3c094a03f9de8ab22745a191e82 SHA-256: f87611c3f5d1a4884d17fcb2f317dda2093df727ebe3e9cd56f7ee63d1cb7abf
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a phishing lure, including being image-heavy with a click-outward action and a small file size. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious sites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier clean score 0.1478

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 66 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://inwebjor.ru/uplcv?utm_term=need+for+speed+wanted+mod+apk PDF link annotation
    • http://gmtshipping.com/attachment/file/51030156937.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613467c48069d---14067377323.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/93393903728.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/99582603010.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/julajox.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/jabujor.pdfIn PDF document text
    • http://tms-technology.com/ckfinder/userfiles/files/vukutinewefesevatabiv.pdfIn PDF document text
    • http://thesei.com/In PDF document text
    • http://polkovnik.su/upload/file/34471136155.pdfIn PDF document text
    • https://ducthai.vn/userfiles/file/jufigurafibifosuku.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f764246cba---5794607560.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/88a268bb35bc20202d6352f128a43343/31343901179.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/fkvvq7h7o2n184rlqdf2t42d8b/davapizurimagusajonoxoxis.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109171355243134.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/jisefevo.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613715ed5c0b3---5955293213.pdfIn PDF document text
    • https://iwistw.com/upload/files/69289295177.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/zowelekapogusofob.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/37476255450.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/nopit.pdfIn PDF document text
    • http://koutingchina.com/upload/files/vosepejadawigagoxaluxof.pdfIn PDF document text
    • https://arkadas.yuzuktr.com/eskortarama.com/resimler/file/68579336128.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/81434581296.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021091205242615.pdfIn PDF document text
    • http://damvua.com/damvua/public/images/files/supujonaxotitatix.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/sodonoxuwubigapaj.pdfIn 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_off0000b1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CE 10676 bytes
SHA-256: 62ad07d2b20a2eda822de3efd6b1037d3ed17236e4c0d44183eca8af2c9b82ae
font_02_sfnt_off0000e261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE261 14180 bytes
SHA-256: 135d0a054850063beedacbc8ce6a39263f25345baad1408cfdb004a110dc6dd2