Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc4f3ce34ba59641…

MALICIOUS

PDF

91.0 KB Created: 2021-07-03 08:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c4af5570a4e0113c3d8175bec62b2ef1 SHA-1: bd02fa256663c8e6b9d916d33b7735ecbfd1cbbc SHA-256: bc4f3ce34ba59641e40f0b5520d4db80c24708945b65ae096af851a1c554a2f5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious content. The heuristics identified it as a link farm pointing to numerous PDF files hosted on compromised CMS upload directories and disposable hosting. This suggests an attempt to distribute malicious content or engage in SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://mmszke.hu/files/file/33210781996.pdf In PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/3ce664nrag3k1hh51e1a404us9/zadukizeju.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5989fba03e---43267246456.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/20655471498.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bace50e687c---tiwibilaxad.pdfIn PDF document text
    • https://tessuno.com/upload/files/60d2137045d05.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/81ujvja6jknqiq0bddlf962n06/xupovawoguxuxox.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/wotenovibomos.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/e8tdc2f5tpioc2vdmqic5u00qm/lefosifok.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/4c15a15fdedc1ac52e22a68f97603ce0/bozemexapiwidu.pdfIn PDF document text
    • http://salinahighschool1968.com/clients/3/33/33fcb9b832a528c934b1ac42c6b88a99/File/73371262187.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/nojudugetabuvesex.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/a72fb7279c442408e80600ac861cff87/49951463339.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/h36kkppberu2ig18p7s021s487/muzesotunu.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb05ceebb3---wikez.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16070ff168556a---zikumetizoderakepubane.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/c464e5541a7cdf10281f7f3cbf83fefa/wozorowikisefu.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/jurilolebukusobatu.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/3hpid55v8srd9ep605icc1qkqp/75872105795.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/giwiluxoboranotuvuxopab.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/68695716355.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e0d809fe1---21136536459.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=tame+meaning+in+teluguPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90A 19276 bytes
SHA-256: 93a76c51d11466c7d7db6f05fa51edbbd49b5d8fb9d1f68d1cdef557aa224764
font_01_sfnt_off00011a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B0 10128 bytes
SHA-256: 5b5f424961ec84a68e367cab407441d4be4ade49976d34b86eb344ae147695d2
font_03_sfnt_off00014933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14933 5932 bytes
SHA-256: 38522001f5474ed0ef062e18e1629d97a7e2d268921a9456021599fd588553d5

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