Malicious PDF — malware analysis report

Static analysis result for SHA-256 bab8f0e3a3039396…

MALICIOUS

PDF

70.3 KB Created: 2021-09-25 19:17:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 32759939309955d307c25e6f980f8ee2 SHA-1: ea8cbee98f8f0628820298a924ddf241abeed490 SHA-256: bab8f0e3a303939628b8b53e4dc8fa340fa3e8b1d73e1bcdd7e11920228121e5
116 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicative of a link farm. The ML classifier strongly flagged this PDF as malicious. The presence of a QR code lure heuristic further suggests an attempt to redirect users to potentially harmful sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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 https://pixomot.ru/uplcv?utm_term=how+to+add+extension+in+chrome+in+mobile PDF link annotation
    • https://ruh-center.ru/userfiles/file/6758580207.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/30695144101.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/69246730505.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/vufipox.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/gomogipimumaku.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/novetaxadonulewip.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134d842b274d---numezizuf.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/nomofasutufataj.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/tafozo.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/xiwituretojitoxot.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/nazuwu.pdfIn PDF document text
    • https://successalpha.team/upload/files/kopudukafemelinugat.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/kaziwovidoged.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/36617579110.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/70273678116.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/91376451659.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/21448044315.pdfIn PDF document text
    • http://sxcec.org/userfiles/file/68727529380.pdfIn PDF document text
    • http://yepuco.com/uploads/files/37121521015.pdfIn PDF document text
    • http://chongros.com/userData/board/file/45978487206.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/0j6j9a2tfeokl75fie9ul07ob6/tosebupujugokoli.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210910013311.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/e3505768ed906e18db38d851ecef5c79/33951885300.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/t7n8urgv5j0c5lh275p4eegrfc/kumigiw.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/6fb3b0062658f61b36120b26dc80ae67/losuwomiji.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_off0000b18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB18E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A5 10952 bytes
SHA-256: 4475d00e04fe05fb699b149147c8342187cbb1347afcb223d93c764fb0996372
font_02_sfnt_off0000e2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DC 15816 bytes
SHA-256: 23dda53646d4abdda4bd10a7df1a067344a3fc18b37dfb5bc0ecf056fccde37d

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