Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d8d024de96bda5e…

MALICIOUS

PDF

87.3 KB Created: 2021-09-07 19:29:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e70825c794592be5d3af534a5e6960ac SHA-1: 2376c076c839f513db926484f1a3d6c2be807a3a SHA-256: 2d8d024de96bda5e4eedb965ddb473d57dcf4e613f495d6eb31a320c053c208f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV both flagged this PDF as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to compromised CMS upload storage, suggesting an attempt to redirect users to malicious content or download further payloads. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://daquin-ferriere.fr/userfiles/file/95844843821.pdf In PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/b6b4821620b646cf8d1d95d5af20fbd9/95984423693.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/8dt6jqnc0850rcfadhrdi55dpq/24543304835.pdfIn PDF document text
    • http://iwort.de/userfiles/file/jotef.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/h8hqadsd2uj02lrscplh24aart/99782206125.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/99360740326.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753bda152f6---18584717752.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/75k4fa9fd53suuj274fhsrd09t/77751972788.pdfIn PDF document text
    • http://newtrierreunion1962.com/clients/6/64/64567561842b0bbd40b956adda0282a7/File/xunonekipivu.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/7853932041.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/bujoditigekiv.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609105992fef1---11965462741.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/poxizenedikilu.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/xasuvovojizukimeme.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6abbb51fb8---66556327859.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/1e30073f98d61f5cb64102331c24334b/19084088574.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/liker.pdfIn PDF document text
    • https://tepihtrava.rs//files/85358552166.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210822_D70228D15D2B4E60.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/jobejitopazidonanidow.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/44004455691.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4466b76392---pavufu.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bafeeb4afe---59913745464.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=definition+of+mean+and+standard+deviation+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_off0000ee83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE83 10680 bytes
SHA-256: e4c1b3fbc8b5184b30474990310e2db178b0eb26744da6e0dd421303a23b1154
font_01_sfnt_off00010703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10703 18632 bytes
SHA-256: 8cafdc5c63225d1b1e7c9004b11d71f216db0d39c650995d650553fc9a77dda2
font_02_sfnt_off00013794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13794 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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