Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2f8603d1fc002de…

MALICIOUS

PDF

83.7 KB Created: 2021-06-29 07:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ae6d0351a0922df46acf7fc25033734f SHA-1: 229d20a84b274eb87733f742b08ba5a8a25d7c9f SHA-256: f2f8603d1fc002def91e77cd7a5a7372c02f09332494bbc4c37aa59fb66c82b8
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised WordPress upload directories or disposable hosting, suggest a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its true purpose, which is likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drafthe.ru/uplcv?utm_term=use+of+especially+and+specially
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae026aedbb5---vudoxizemobajewozibo.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/sunubilowisisorizifilaj.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b03ed22ce9b---bopakiledevu.pdf
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/ec3443704293e5cc3b2458afbbe48c16/zakojevot.pdf
    • https://majubesar.info/contents//files/lakonikezinopimugiwa.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609605a0b2b48---zozodiridozipaxerowetudaw.pdf
    • https://bettyloupaints.com/userfiles/files/sunawudetexujifiniko.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/caca58179bbb8a8b5f0722a1659cf4a9/dofavawufigiwuxaba.pdf
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/misowazadebekeg.pdf
    • http://tydafa.com/dafa/uploadfiles/20210609163149.pdf
    • http://koryosushi.com/uploads/files/56881110494.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160ae26998b7a2---65324648503.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/6piiis4vbb12c5b191gcccfjc3/77353741514.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4dc20c38b5---bifaralapevumudedix.pdf
    • http://geyikkimya.com/userfiles/upload/file/wufin.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/0777339f2d2934889e4622fd85e5c7b9/gaxuvobejariz.pdf
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/wegajo.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c3831cc6f---topirexut.pdf
    • https://topupdana.com/contents//files/wivewaluwu.pdf
    • https://baatco.com/ckfinder/userfiles/files/xavetilutinimije.pdf
    • http://polish-house.com/uploades/fckeditorfile/fezijeb.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/d3d02815e097f639d3e942fb58d246a8/novutimebobawobeb.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/7e3a148a219700e475d4bdb652a8a116/33021805819.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/h1eg56ha83qp1c5t74d6nm83oc/48221041028.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05c0112857---kobesenex.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e536.bin
56c2f900b9ddbb80c47aae5df9ef7351319282a02174e8d8ff4dfd3ee482d499		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE536 10536 bytes
font_01_sfnt_off0000fd52.bin
07e745a74c775d45a49b2be12cd5310a47672c5df157abe59ab1cf227981fe16		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD52 17016 bytes
font_02_sfnt_off00012964.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12964 16792 bytes

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