Malicious PDF — malware analysis report

Static analysis result for SHA-256 cec979f11631cc0a…

MALICIOUS

PDF

103.7 KB Created: 2021-06-26 03:05:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 45a30341ad7847d4d0edfa1b3cc1b116 SHA-1: 34e292b9f3214b44066e771064c3f31045240198 SHA-256: cec979f11631cc0a35e5ee3091741ed7a25d7931298eced759fd352b382a3e82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits PDF vulnerabilities or contains malicious content. The document functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites. This suggests an attempt to lure users to potentially malicious websites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

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://archism.ru/uplcv?utm_term=i+will+or+i+would+which+is+correct PDF link annotation
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9b768bff9---nimozozeduvusositax.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/61ae0415a14832ef54dcf3512551de7e/90226749800.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/279140057fde1e2a23c4b3b78071546a/sogijuxodivejipexapakusol.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b96150a65---fipunogosanegogesiberobap.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bebe94778c2---33730189528.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160d23208ee4a1---95525550039.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/247f79bdbe3ae89f7a8b7aad96d94344/81678856246.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c05a5836b8c---41479618531.pdfIn PDF document text
    • http://kleiberit.ru/files/file/rirejolipexiketakatir.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/e02b45dc6393d4d1bca785fa1fa7d1c9/34874592971.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/nopegexuv.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/0ogsof548uea5p0u3d9jfiqq76/rekigujoni.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/43945330810.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/wixefuxanapisoso.pdfIn PDF document text
    • http://expresskaliski.info/file/letisavozegokixogasuf.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccf0022ad5---lozefasovowejubejeropakob.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/87386207857.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/5beb8f793103ce1ec3a86f55c7c310c6/12023134848.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/59428335016.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/9ndqfo1sn217tif8sc9f7ilpvp/tizenokogi.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/30000411582.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe5c655448---maduzalutofudik.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/88f191fced76e1b66bde247eeb744746/44858679924.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/45678272973.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160bc242db4617---71189578178.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bebf65aea00---tupawipa.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/c602a1bf695b31f96c361c28a95c30e7/13587275090.pdfIn PDF document text
    • 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_off00012ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA1 10336 bytes
SHA-256: e99cdfb3864180a791a78b563cbf8cbea4d295ea0c963feeaa3935123d0c0743
font_01_sfnt_off00014420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14420 19340 bytes
SHA-256: 97f047f1cf5bb3097638041eb6bec77422e02a786b8c2ac331458d71f6d1db38
font_02_sfnt_off0001774f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1774F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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