Malicious PDF — malware analysis report

Static analysis result for SHA-256 38c66ed245772b42…

MALICIOUS

PDF

83.7 KB Created: 2021-08-02 11:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 56b9ee3d0d74f90f189c3936da2a4a3a SHA-1: ecfd27bb10b19799ba783b1368e707a443de04b0 SHA-256: 38c66ed245772b4243582b56a0c694e2b56a71c551ea04d55ff80a8262ae3a09
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised or disposable hosting, indicating a link farm designed to direct users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the heuristic firings indicate the document's primary function is to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://educationindiajournal.org/ckfinder/userfiles/files/16801481234.pdf In PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/5b53644a46e30ae19e5fe97a8626f819/xemuzisitofep.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b50f46d457---wimavixilelapiru.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/3a57f5515be190714d9b95745a2f624b/72903900420.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/geduwapaji.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db4183c17e---44447802257.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609895652f4a7---1404420298.pdfIn PDF document text
    • http://atek-ent.com/upload/file/firajifitiwu.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/gedijogaro.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/e7a86ea33bf164c62165fb026f8b7c44/39679039087.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/cc01880c9d12f3aeed55b44e1b21982c/29020667563.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b58545d59af---futivinudijegega.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/98437705608.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7270106fb---69657245636.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/847bd70c19044106333440b80a5d8ffb/rapagobatexovu.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/d45868fc1d9c964f70d46c753fd21843/37894397455.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/44f512181bda92b9a060f6d49c2241ef/gixitomuteguxufu.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/kuzululekoparewo.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/betuxajubovafagedojabute.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/34776415136.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/xiremuxogewagilav.pdfIn PDF document text
    • http://riasztoszolnok.hu/admin/fck_upload/file/dinasoban.pdfIn PDF document text
    • http://quinta.cl/upload/files/93440415193.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/64780603220.pdfIn PDF document text
    • http://bendhigh1970.com/clients/1/10/106e6567aa8bd3cecf4080670b11bd10/File/37575009835.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/a5d2dd7242aa5ae65ab86a501214a9c3/59437074786.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=deflexion+en+vigas+metodo+doble+integracionPDF 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_off0000e115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE115 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92C 11128 bytes
SHA-256: 8949de7cabb3537d811fdc8705827ddc2431a34c187a3d0072685c22636c2592
font_02_sfnt_off00011302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11302 17208 bytes
SHA-256: 2e0a6a288b392486d856391b939306c983f15587e15e4ea4369f28e373c4e99b

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