Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2befb1783119b98…

MALICIOUS

PDF

112.9 KB Created: 2021-07-05 09:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: eb1e93db0e38a37fb80fc76da042fd76 SHA-1: 15f7a5d04b5acd5b0704303285da2cfaecccf55d SHA-256: a2befb1783119b9893665528f7b17546df7274c9503f6c4e844ae24a7ef58dfc
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure victims to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9777

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://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b0ee37632---73539573180.pdf In PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/6dc29d334dd3d1fe3af98b5b143dd43b/jumititupakemerodopumine.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f42e00dc3---642982329.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/sutebegirisukidud.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/578c33772b5af98986af07adeb2c9e7e/zezoj.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c52243024---gavajosirun.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c07225da7e---72708686730.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160711384e5b12---sarefawuvekitudatefolute.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718380c66b0---jujitavi.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/3031998693.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850aaa85135---poboxitasogujirizizerevi.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/352eeac6776b81c1a60a5c36c194cdca/55474340030.pdfIn PDF document text
    • http://mashtalkandil.com/userfiles/file/savawolumaxo.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/sofamog.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607058eb38b3b---wipumilizoxafuvem.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9fbd5801d---84468928644.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/bidapesuji.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/pitejatumasazirivixutoju.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/javuvuv.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ba8d303f3---rijuvefa.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/26043326613.pdfIn PDF document text
    • http://adveotec.com/img/file/tufakulovogeritazaw.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/03rbtpar9d2l0quvaad3b23d36/73560095992.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f806524bc---budezepirunadobaginalifod.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/1g3srmee2sqjkllh55kokqu6oj/74308903702.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b6474f21391---giselamagufopilevifu.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607525e5619c6---24669048130.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=ai+suite+3+installPDF 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_off00014ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000162fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162FA 28920 bytes
SHA-256: 4bc876d6fb3b382f81c9838c8a2a8b1baa94c057de3d23438be96a0fbb7b7115
font_02_sfnt_off00019f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F6B 10136 bytes
SHA-256: bf1014d5cab70bdb8051e2447df8450ad8f114b8f2dab470f8834b3444682012