Malicious PDF — malware analysis report

Static analysis result for SHA-256 72e0a6d4e1057d95…

MALICIOUS

PDF

86.9 KB Created: 2021-07-05 00:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 430e852b8a4ac5364657ded808d96a9d SHA-1: 236b5ae991c3bf090ca7c30cdad261348ecb9809 SHA-256: 72e0a6d4e1057d95e28f938c9874145429034dee4c53008545d8cf0c5634c4cc
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it's used to redirect users to malicious sites. The PDF document body was unreadable, but the presence of numerous external URIs and the nature of the heuristics strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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.biotanika.pl/upload/file/11609119238.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ecb5856b6---xijaxakamatez.pdf
    • https://weilaimachinery.com/userfiles/files/57065899060.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/82s0qmd0c9ar0vg4tausjqjq9o/tipikomibifimivijupopor.pdf
    • http://megat.pl/uploaded/fck_files/file/43712280266.pdf
    • https://hanurichurch.org/ckfinder/userfiles/files/24534624064.pdf
    • http://aliglobshop.com/userfiles/file/teposipuwulenotawepe.pdf
    • http://aqbnb.com/uploadfile/file/58572378885.pdf
    • http://diamondsnspurs.com/clients/12200/File/66792755302.pdf
    • http://animalscipublisher.com/files/upfiles/file/dubivalo.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079445272c03---58365218449.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/587f23d2fb26d76c5861093c4d81bd1b/tagekoxegama.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2ca7a839e0---80929870449.pdf
    • https://textolinguisticsolutions.com/upload/editor/file/wedul.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607682e66517e---vumimageku.pdf
    • http://vieclamquantri.net/upload/files/99136634633.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1e044fdcd---gexob.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/fa56abc7297dbc2d97d434feccce9eb6/kisidikipaxonakupupovi.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/e5acea667306bf339e310d429d769f8e/29225255770.pdf
    • http://aaaexpressac.com/userfiles/file/lujifepu.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160815e409e9e3---20443006745.pdf
    • http://55pluscommunityspecialist.com/userfiles/files/99423764252.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/031ec84b2319ba0d1ec145965d00f2a9/34495347562.pdf
    • https://clumba-indoor.ru/files/files/dimawatalodemal.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/00covef7fi2pc1s4j5uq29djbg/bupibasebabalejetamo.pdf
    • http://altaprecision.com/userfiles/file/niponanoxanimunogew.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=growing+romaine+from+stem
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee49.bin
e218e98430de51b7db92add6da36d626ae0350f62994cd71ce1a2b1c72647695
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE49 18076 bytes
font_01_sfnt_off00011dbb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBB 16792 bytes
font_02_sfnt_off000135d2.bin
da35db80bed6c457c0c49e1c392a3052b175b50c657a3068b0f601b108ba985b
pdf-font-stream PDF embedded font (sfnt) at offset 0x135D2 10636 bytes