Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c1676e1815b256…

MALICIOUS

PDF

81.0 KB Created: 2021-09-07 10:25:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c924d1a82b482e6a605f4d8ac52285cc SHA-1: a1df271b76b44fda4a7164d0d4d816f348a14961 SHA-256: b6c1676e1815b256dcc950b0bbe8e035d44e1072449fac79984fc013207f6ece
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent to trick users into revealing sensitive recovery information. The presence of numerous links to potentially compromised WordPress upload directories and disposable hosting suggests a broad phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a66668c2378---55033212976.pdf In PDF document text
    • https://sabagdasarov.ru/upload/file/70350892686.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/21bocdn42s6u1evblvrok6dc76/17373877655.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/45115846082.pdfIn PDF document text
    • http://sozopolihills.com/userfiles/file/21857579821.pdfIn PDF document text
    • http://hzdshg.com/images/upload/File/42846258498.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/jijonisuvomi.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9ae3181e609ab3f56c429ddf29370cba/34264445056.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/14391692638.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d3a5ac09175---12057210113.pdfIn PDF document text
    • http://clasesholandes.com/userfiles/file/67738402104.pdfIn PDF document text
    • https://primer-spb.ru/files/files/89031570852.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16094c95936ee1---rotesupazazipiketisifovoz.pdfIn PDF document text
    • http://nhhs78.org/clients/63854/File/wosagufejim.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/texogixiziguzo.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/taxopitijosimezijawunalan.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/11733012557.pdfIn PDF document text
    • http://e-sportis.com/images/upload/2126238901.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091af7e8cef5---navagaf.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a40af10e782---27448391992.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210717142045.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/89790466193.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/50141206462.pdfIn PDF document text
    • http://mobitransjogja.com/files/25157510356.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/fiwabamafokinevojatidok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=pdf+free+download+for+applePDF 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_off0000d858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD858 18208 bytes
SHA-256: 2287d56dcb41769565b6aa5f47dfe509db5cce64bdeb842050ebf5cdb445d8e3
font_01_sfnt_off0001077c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F93 10220 bytes
SHA-256: 1f58e56ad5dae9096e1d5b378570a7c5dfda9d847eac870585d551beec49904e

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