Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc559a086b0418f2…

MALICIOUS

PDF

69.3 KB Created: 2021-09-05 12:24:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 48f189a8583b140e4ff3fe3db4d82f89 SHA-1: c705af00b6d6948230143702ea166780ee075cf6 SHA-256: dc559a086b0418f24427d1ff793dfccc7ac2bb4e126f155ce730b89fd54ba4ae
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting. The primary attack pattern involves luring users to click these links, likely leading to further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a40ed7c3074---naxapelopimidimuvo.pdf In PDF document text
    • http://verynailscm.com/user_img/file/zorezunuwososi.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/xikesajedebisezuraxelez.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/64339430407.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/9b1b5e19159a3a314aa1967d2e09d310/kapurakomexezuwusulenuzi.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/92eaa92a1341b7a942126c801b9d9a06/29131948253.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/19548153448.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/03646e1f8b6bd6ad70773c8cff06524d/taragoxosu.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/e2f456d2c3a1cbf774b3c4ed30255e96/6770972740.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160f6b3a89ef54---81219177148.pdfIn PDF document text
    • https://bor-diing.com/upload/files/35784953315.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/66537217543.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9cc085f29d---49849713387.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/70628256858.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cb6d1420d1---kuwagej.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0667b4c36---96297322389.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/84f602b8c388fca37a61f3e86228f7c5/dadedetokedebilikelorutu.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/xadedojazatokomazuxe.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/koludobatiritutufidi.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/1629146850ef6b5d75d5a6a11afcf.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/nezefujotamepoduripiji.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1607473f915928---kajolabevigoporole.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/42709841197.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=surface+conduit+wiring+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_off0000b2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E7 14532 bytes
SHA-256: 2917209fddc919e18bc93c6db3df99d81dd709ec4ea1d997f229e368d7f69101
font_01_sfnt_off0000d694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD694 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eeab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAB 10840 bytes
SHA-256: 51eaef6b114bb85995d73b33432192316f6f5064fea70fdacb1da1629f9b960d

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