Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2701ed3742becd0…

MALICIOUS

PDF

71.3 KB Created: 2021-09-12 16:36:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: db41e04620f55b5b565fb252ecece4fd SHA-1: a24e88cf8b9023c38438668d2bf5b857f977ed5a SHA-256: a2701ed3742becd001c81ce5e0d904abd8cb405aa000eb279ca97b539aea30f1
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely to distribute further malicious content or phish users. The presence of multiple external URIs and a link farm heuristic strongly suggests a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://wenyanchem.com/upload/files/kibasawotabarog.pdf In PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/67862786369.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318939eed54---20927973510.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130fd942f7e5---dabavamidilifigipivetunu.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613006b5cb047---51735140005.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/38784567098.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/fupamekojiwimatomogaluliw.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/19519921073.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/74606263832.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/vb6on4223h4j94rts3lks632nr/78775625638.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/87347934685.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/37304923671.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5637e52c1---domojedorofuwolejedof.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/14735433363.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/fodewurovozanejidit.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/wojap.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/74509671383.pdfIn PDF document text
    • http://lse.hu/userfiles/file/negijuvevip.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/dinimezi.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba42491c74---49001610681.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/17430616166.pdfIn PDF document text
    • http://hkwwta.org/userfiles/kowad.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/8e91c79b400a563d4cf8bd9f7eaa3465/bivirotubax.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/49257014253.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11736465868.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161388e96e04fc---jimexosodureti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=hard+deathrun+fortnitePDF 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_off0000ba41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA41 15112 bytes
SHA-256: 7669a32760beeaf011e1330294ff537d83ded54dea92f23d4e99edcb95a34131
font_01_sfnt_off0000e02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF841 10328 bytes
SHA-256: c65f97f7988ec3c2cca293887f42ebb63c88c068ae9dc904386d03c39af7a875

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