Malicious PDF — malware analysis report

Static analysis result for SHA-256 9100ebeb0d4e3e0f…

MALICIOUS

PDF

85.7 KB Created: 2021-07-01 13:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0e6c52d1ff8f3e895aa0c183f4d9a999 SHA-1: 9c06fc16bce1ad564c6bbb1eb9a1cc38157063f5 SHA-256: 9100ebeb0d4e3e0f53802fc096dc685dc6a849166c6ae52aa1ebebd2c19619f1
156 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics confirms the primary function of directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crewmak.ru/uplcv?utm_term=5+qualities+of+a+good+journalist
    • http://meble-tk.pl/userfiles/file/31558672189.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0de139df92---47054478186.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/xosajaroxefanetugerur.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608880a49a8df---77903027271.pdf
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/b9f61a335e68ae7d846e29b81286d1de/94001425329.pdf
    • http://musorcentrum.hu/files/article/file/waguzubuk.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087ae98086b4---45988794851.pdf
    • http://aivieksteslaivas.lv/userfiles/file/wabilavomusajanuwozuwuti.pdf
    • https://go2germany.ru/files/file/dedoleveje.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/j8l2i1figcib02sb7cj6l04jof/sevaxadipepujo.pdf
    • http://stroisvias.ru/userfiles/file/44970392036.pdf
    • http://chinahongji.com/d/files/nizoj.pdf
    • https://hoangnhataudio.vn/media/files/vesorosewumofavatoma.pdf
    • http://animalscipublisher.com/files/upfiles/file/81073553247.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a8b4c6740---fononixifeluviwosa.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/t31qjrnu68tm2up0sdgo99him5/laweremefif.pdf
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/16988442c9bdf0b265e2d9dc96631b73/kewekumetidebuxiwuvu.pdf
    • http://banghetretunhien.com/media/ftp/file/4096494679.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f100bb3fda---74916916682.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/a2e3840206682eb038e29e8d76e9846d/9534569538.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/joebb29ido44gvoad93q9v57n2/nanemunajixibob.pdf
    • https://eitmedu.in/ckfinder/userfiles/files/75609555004.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7c330c29f---58992693178.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_off0000ebc7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC7 16792 bytes
font_01_sfnt_off000103d9.bin
d0e440f1f86f39553aaf9e10862a46ebd97b90953fdd934adcbcb730fb50e389
pdf-font-stream PDF embedded font (sfnt) at offset 0x103D9 16936 bytes
font_02_sfnt_off00012f07.bin
436821a1c27eb7f36768ba017db89f87cbebb16e37c0f00621433c8df85c33cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F07 10944 bytes