Malicious PDF — malware analysis report

Static analysis result for SHA-256 940441ab7750d88e…

MALICIOUS

PDF

96.1 KB Created: 2021-08-19 17:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 656f79b602f18f51f63aa4711f5bfea7 SHA-1: cfce72af97f1ef2b6d985f112f739a19eea46b8b SHA-256: 940441ab7750d88e5eb5bfebfca1eed3ba26ad2aba024d1e71bcb3745bc66c99
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of multiple external URIs and compromised host links suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://commandhousecreations.com/uploads/files/96142582779.pdf In PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/33443682217.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610badfba1fa7---busumadixeve.pdfIn PDF document text
    • http://scpt.it/userfiles/files/50651214982.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/firalokojowed.pdfIn PDF document text
    • http://allycatering.com/userfiles/tusowepomalafupijiludowip.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/vatimi.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/fevuxixetiribobonu.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/c0ea9760231adc5d3c2d54ca30f0d145/lifizosuzotulelu.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b70a77389---30450611667.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/56350156016.pdfIn PDF document text
    • http://dyweisheng.com/uploadfile/file/2021071923343173499.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/25a24d9b29b9bc833860b3af0ea3f8a8/33611693921.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/ac86fcf4acb8ba1faead0a64156d5fa4/kilazorudanixowepakito.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/mokokumonijobi.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/dubakitike.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/l1d7pj9vptp2rjiqra7sd00nk7/36213156589.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/venukadewuvaxi.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/tobunaxesivesonex.pdfIn PDF document text
    • http://cuatudongsaigon.vn/uploads/files/gezipok.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc293cbe72c---714430029.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796400ea27b---gesipirezuk.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072896d0e453---43325509976.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=nmc+cbt+reviewer+ebook+free+downloadPDF 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_off00010ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF1 19128 bytes
SHA-256: 25fc3c912865f5eed3250859aa283ca03a6616d6f0c4f7c550a2987f6baf6d70
font_01_sfnt_off00014135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14135 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001594c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1594C 10828 bytes
SHA-256: 0de3f9ed0f7660c84706b5457a10cebcb44689f8d6d0a2d51fe8dc541bfaf9a8

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