Malicious PDF — malware analysis report

Static analysis result for SHA-256 12d7865e54712619…

MALICIOUS

PDF

74.2 KB Created: 2021-09-08 02:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 739173413e45fb175968c72e9ddaf67e SHA-1: 04e89425e3f1fb2dec88d1326c761063444cab34 SHA-256: 12d7865e54712619231a50e53cff6be489f31699f12a5f2c4b88bc72068b07bc
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to external sites. Several of these URLs are hosted on compromised CMS uploads or disposable domains, suggesting an attempt to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

Heuristics 6

  • 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.
  • 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://lecachet.fr/docs/files/sepoligo.pdf In PDF document text
    • https://honghow.com/ckfinder/userfiles/files/59380323254.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/2basctj8botof8evjamb06ac0d/runexokaj.pdfIn PDF document text
    • http://polipack.ru/content/file/4617769527.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/97091538082.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/benofurinewov.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/bafotuxogutud.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/22786301181.pdfIn PDF document text
    • http://waltwhitmanclassof1965.com/clients/c/cc/ccbfa8a87e297cd67510599b8aebcb74/File/29967443826.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe504b9ec8---23260183846.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8ff780a0a---sapufamuma.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/tederagexopo.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160ce6d764f9ab---sivipipiwa.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa41b19510a---16082021662.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3ak3md02dbiba0i647jhfj1410/watevadowotalunubaw.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/94928263865.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/0fa462b153b3a47c7d7d4eeaa704494e/45144147825.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/52e32da69f32282cd1d978c2d086918f/4144447893.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/xebulimilamigadufiwoxaluv.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/wewotelokekuluwiguxa.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeaf2dbf7f0---72680406489.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/82954716517.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/zomod.pdfIn PDF document text
    • https://stvorki.ru/files/file/31676825849.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/59780780398.pdfIn PDF document text
    • http://muszempilla.com/files/file/rumam.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/spp7m97r4suj31oq5la5504kmt/43114786022.pdfIn PDF document text
    • http://cloverdiamond.com/file/jozotagovukaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=common+ground+integrated+reading+and+writing+pdfPDF 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_off0000c10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC10B 15872 bytes
SHA-256: 748be431fefc03a614c171ea82d88fddf3fbf643811e36e509d65166c36ec1af
font_01_sfnt_off0000e90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10125 10844 bytes
SHA-256: 15678cdf5016339433a54461dd378fcd6c71bb9ce13659f820ae04065a50612b

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