Malicious PDF — malware analysis report

Static analysis result for SHA-256 392831a93ad6de01…

MALICIOUS

PDF

76.1 KB Created: 2021-09-18 08:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5e526518c1853fbcc0895b767854bae9 SHA-1: fedb0cd1e62b7615abc019a97d1c82812eae4e82 SHA-256: 392831a93ad6de015ba3052c05c37883c0bb2281719da0289989651f070dacca
176 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a ClamAV signature and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to lure users to malicious content. The presence of numerous external URIs and the compromised CMS upload link farm indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/7fca2236764ddb4287d82c5af6cf18b1/bemolemuxa.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdfac31ec0---64938688041.pdf
    • http://vako.vn/app/webroot/uploads/files/11900354883.pdf
    • https://vyaspublicschool.com/ckfinder/userfiles/files/wudidipelikakizifisufi.pdf
    • http://1night2day.com/ckupload/files/biwapakigikufikemota.pdf
    • http://doctour.hu/uploads/ckfinder/userfiles/files/xulufapafibufebisox.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/e3edc2e9e72cce4fca795e451a4a6d15/37094451109.pdf
    • http://primeasset.hu/fileok/file/70947168697.pdf
    • http://www.anaja-inter.org/public/file/1905745392.pdf
    • http://maternites-catholiques.org/ressource/site-image/files/kojopulukaba.pdf
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/58059347265.pdf
    • https://www.assofmt.org/ckfinder/userfiles/files/wuzuxuduvopuv.pdf
    • http://reguitti-engineering.it/userfiles/files/domujolizudesamo.pdf
    • https://bozoklar.org/ckfinder/userfiles/files/55839774119.pdf
    • http://fitviewer.biz/files/file/lugitemofevijuke.pdf
    • http://comlark.ru/userfiles/files/42908384843.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16131200e87b7a---30291839433.pdf
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f884a446f6---xirojasafewimosarefole.pdf
    • https://sanidom.pl/img/file/83725661090.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/f2920abd5545a42b2be7b72baa1ac05d/birudusewogugonixigugoto.pdf
    • http://shinhwajudan.com/userData/board/file/volaloziziwiw.pdf
    • http://mrybalko.ru/files/47202050212.pdf
    • http://visusmarble.com/images_upload/files/69453699402.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/9d1ef4120532e63496edd5088bb42935/lebemuk.pdf
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/79177422572.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=dynasty+warriors+unleashed+android
    • 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_off0000c595.bin
1c2165df17547f3e23a51ae100983654310dd0079745121fc9ced5f3d637ff12
pdf-font-stream PDF embedded font (sfnt) at offset 0xC595 10644 bytes
font_01_sfnt_off0000ddf4.bin
6877bddadaefc764ac36f0cb336e49b61647604b8eb00630f55fd61726700098
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF4 17268 bytes
font_02_sfnt_off00010aa1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA1 16792 bytes