Malicious PDF — malware analysis report

Static analysis result for SHA-256 c797e8b81989cf62…

MALICIOUS

PDF

84.0 KB Created: 2021-09-17 10:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7d8f27a1bf09d2fdbf9f962c55fd5bb1 SHA-1: 418c8625489b2b447d8d172738e12cd2cacfeab9 SHA-256: c797e8b81989cf620e94989429607b5d1c0ff51a5fbe882eb07f2df40e9db928
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to potentially compromised WordPress upload storage. The embedded JavaScript likely facilitates the redirection to external URLs, which are part of a link farm designed to obscure the final destination, a common tactic for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://akapacha.com/userfiles/file/xitasasimoxigogurifexav.pdf In PDF document text
    • http://madonnina.info/userfiles/files/tibupev.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16142c44382157---purujutibakoxelolav.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/kulufawedevivawuxonir.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/46361911997.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/etokevogevu.pdfIn PDF document text
    • http://shophouse.info/images/files/95234192295.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a7d29a6d7---3969148551.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/4452782066.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/8404130840.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69499571774.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/4431622703.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/84548133096.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384a8b43aa5---zisafexemibenu.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/29460321309.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/nusupuzijubagafinovos.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/jugenaj.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/pukugo.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/losenukum.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/mukisafikawukugumurog.pdfIn PDF document text
    • http://bifruit.mk/ckfinder/userfiles/files/lolibodi.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e80f312c65---93515306484.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/83076598282.pdfIn PDF document text
    • http://guitarenko.fr/img/files/xuwufedomitorupivupu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=solve+x+quadratic+equationPDF 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_off0000e5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BE 16708 bytes
SHA-256: f2870ed6be5345059178fee3049ffdff16db08aab1b6db0f12a177b2fcdf9b13
font_01_sfnt_off0001115e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115E 10684 bytes
SHA-256: b89246863f90f67a0d592df6dbb56310559e4cf91beb46b6fb4d5d8311f71e80
font_02_sfnt_off000129cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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