Malicious PDF — malware analysis report

Static analysis result for SHA-256 e531599678d994d7…

MALICIOUS

PDF

81.9 KB Created: 2021-09-12 11:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c89c544ed8d81478ce93da4f7a6a86eb SHA-1: 63c699bb764c7081913dccf9d9c67f06205060ef SHA-256: e531599678d994d7f778c495dba738b2e980999bb6aef007b0b3a5adb7364a2d
216 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent is to trick users into providing sensitive recovery information. Multiple URLs were extracted, some pointing to compromised CMS upload storage, suggesting a distribution mechanism involving link farms and potentially compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://vallovin.it/userfiles/files/rerefumepidowus.pdf In PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/6080693209.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109071534399559.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/jifefifubaluwolofanisi.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/vasoromikuv.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/buvajokuxidibilajovut.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137aa633e168---gekanavezafobesugux.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/gapazetavugezinesoz.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/kotizenegolevelefagefet.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/bupego.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/5825502600.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/27101221606.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/30318773499.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/60791506396.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/3704866487.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161388e96e04fc---jimexosodureti.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/kupifo.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210901232958.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b39a08c3f---20069197574.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/nuxoguzarizemovixugiwax.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/vokirogezukotopuvo.pdfIn PDF document text
    • http://harlit.com/upfiles/file/11902846330In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=freddy+4+download+freePDF 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_off0000de52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE52 10244 bytes
SHA-256: 98c755de77d9687304ba9b7330748e21764bf273bc727c93c965b3c2d528369d
font_01_sfnt_off0000f588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF588 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9A 17316 bytes
SHA-256: d2952418d5a152da9e34571d0cb2ce89b159a33488d19d3b301aaa8b3a4121d1

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