Malicious PDF — malware analysis report

Static analysis result for SHA-256 e642a40a5b48f4e3…

MALICIOUS

PDF

87.9 KB Created: 2021-07-01 14:37:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 311165ca45b758a7b0af8fb826ea09be SHA-1: 261db7e64e78302c2f2bc33a7e1a126f9de234cd SHA-256: e642a40a5b48f4e3c99a8367d3953266163ad3341fc26322d4a64b3ebfed52fd
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Multiple heuristics indicate that the document contains numerous links pointing to compromised WordPress upload directories and disposable hosting domains, suggesting an attempt to lure users to malicious sites. The presence of a 'download button' heuristic further supports the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/pakaw.pdf
    • https://unosms.us/userfiles/file/95314997696.pdf
    • http://geotersrl.it/file/84030131534.pdf
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/54e288f504185b3d7a00ae391fc64068/82361069223.pdf
    • http://yorktownhs1987.com/clients/57482/File/gijogijareriboxexoxew.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/64n18ebs1u7cg7qgbisjomrq37/xuniduwi.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dc5a28771---vedawizat.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16072bd3fec088---19514988766.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/5a77d6bbba9c53c8936f8592c688e9f8/60442387621.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/bec3torcci81oclj6n148utft9/9357216786.pdf
    • https://ayurvedaemart.com/uploads/file/lazowonudekavelix.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/78e942f85b4a94b0425528e52ae976c3/14619785000.pdf
    • https://ascinfratech.com/clientprojects/trading/file/28470134522.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/kffhd7b6mifb97da2vsuerl00r/64296415616.pdf
    • https://eurouniversal.eu/ckfinder/userfiles/files/41177483375.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/2ef38f4fd225989bfd0467fd5db1a376/90365706652.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c40253b3ad---48188753975.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b49e783f3ea---3427570927.pdf
    • http://podlahypilat.cz/admin/file/zipemisut.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/a5ab668d8ac28cff9dd623535f7e732c/xunuronotolozovelewe.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/fstlq350bn87h92mob8rdmdih5/dufunolukikituwexufu.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/heu2d5oj6o6avtvkakchj1kc01/55824267514.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/128c20461d04bfb68a050d79b97a9bc2/80793027087.pdf
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/38208168240.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=the+best+open+ended+questions
    • 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_off0000f600.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF600 16792 bytes
font_01_sfnt_off00010e12.bin
7b24563814164683dab4f38fc12c288499dcdb742e4b7b02dd07a2f27d1a428b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E12 17232 bytes
font_02_sfnt_off00013b0c.bin
9c606f3b1dc2fd5875f5a92a88b9a03940a5ecfc8c6dfbb3831922fcc6fa6adf
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B0C 10528 bytes