Malicious PDF — malware analysis report

Static analysis result for SHA-256 72414fdb62982257…

MALICIOUS

PDF

79.7 KB Created: 2021-09-20 18:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7cd51aca6015647016981853e6045895 SHA-1: 6aa64fbda2bc98c34df6fce5494e12e78ae3f419 SHA-256: 72414fdb629822573e3e2b9efbb3bd8015a95cb800788e0369ef7d70fcea6694
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to unknown or potentially compromised domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a pattern of using disposable hosting for link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://coreaad.com/DreamDataUpload/file/kosafededalewo.pdf In PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/pukunitupibal.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/vikefog.pdfIn PDF document text
    • https://musluogluotomotiv.com/upload/ckfinder/files/mosurakulidewi.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/61434540451.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/56709356007.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/42863532446.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6fa201522---soviz.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/fotobamasiri.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/xefirulodufudivumodirakov.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/piralovemogidojev.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/xobixavi.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1af1b1301---makipelaxefowulu.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/kivenuvagaxowesuva.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/ponira.pdfIn PDF document text
    • http://chromavials.com/d/files/79318172333.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/12417578379.pdfIn PDF document text
    • http://zlhk.ru/upload_picture/file/tigevodozizobonogu.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d27c26c1ff---diduvobopenevire.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/tedofikeledaku.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1dfc5a168---lagifek.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/dalonet.pdfIn PDF document text
    • http://craft-personal.de/userfiles/file/nebovutitofupijonaxuroxa.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/5328743451.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/kezamoxemamukono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=tamilyogi+conjuring+1PDF 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_off0000d6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC9 10536 bytes
SHA-256: d863b87e33bcba94d837010a2ecf3bc48a9c5a2dd7b4656de03bf0e93a217e5b
font_02_sfnt_off000106bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BD 16400 bytes
SHA-256: b510af277d1fb577d85cc98abfa8b4097edaa230c26050ff1d9fa34d8e1d43bd

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