Malicious PDF — malware analysis report

Static analysis result for SHA-256 303339c92d3da0ec…

MALICIOUS

PDF

140.3 KB Created: 2021-06-20 17:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 498dddeab5664395cf3e83effe43a33c SHA-1: 9b0d62c436a9584781d283e7c2d2fee651effb6f SHA-256: 303339c92d3da0ec8abea4cee247b96a55407806c41b5adb6031c4d2bc2a2e5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://kme-kme.cz/files/file/woxosi.pdf In PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab66347bdd---48954265246.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2593b28960---7282538313.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/9e9i1h07ek3qpdtcvvn9l65n59/89694531862.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0d2cd5478---ludekoleneliger.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/e66c24e4bbf9f5b160a0e2468e9ad1c6/fetebopugeberu.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file/%5C/2021061821003177.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cb89b8316af---jupexagabonin.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/7e5712a88987a15539076e244a28c011/punejiwativasuzatotobuw.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/d7e0a5d7c3095196ecadac1313a27a43/raxotilugizoluvamipudidiv.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/dasezodonimijujurufumoled.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/9a6be571e891b588f77011941e185804/dekawonofako.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/70217273256.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/jipisebirumokunaroru.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16089fc1e92140---panoduwuzatukitepo.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/q193v1un7leh6ecq6u9di65849/lomavogafoxa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=demon+slayer+free+mangaPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00014fda.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14FDA 42652 bytes
SHA-256: d340396087b2cc05e954a94f6812fbf5b398ac642f596142801b497fd077a688
font_01_sfnt_off0001d364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D364 5188 bytes
SHA-256: dc555267e27f4365e1b5e36fa0d7e078ae13625d768ff43afe60aa98736113f9
font_02_sfnt_off0001e506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E506 11860 bytes
SHA-256: dd46c7a476456e4b644b44f13061b173363566fa3ecb2c871409ca02fd90c134
font_03_sfnt_off00020cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20CFE 16408 bytes
SHA-256: 07b0340be26647a2d6e08b6ad4d25fa99b9a490516a87c5282068cb58622d8a2

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