Malicious PDF — malware analysis report

Static analysis result for SHA-256 39ff7a7b5f7f1672…

MALICIOUS

PDF

92.9 KB Created: 2021-07-13 12:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e1121bdf81357ba0d64252ef05b8598d SHA-1: bd770a6b198f17fc73850c34c71a640b6e11d75e SHA-256: 39ff7a7b5f7f16721f431baeeee43005e3e5fb557beff717e8463d4092afd323
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to lure users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, with the PDF being identified as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/ua7mq3s1hpah7qjc0llcg07vd0/31050942151.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/f2548fff94329fa68188c8f11ff306cb/lulusuroz.pdf
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/ko5m9dt44f7l16ilqcod5gmq3c/rasunexomos.pdf
    • https://echipamente-scule.ro/userfiles/file/gazidareboxedumumaxipuna.pdf
    • http://iproperty.ae/userfiles/file/wujizemaxuk.pdf
    • http://kidneytexas.org/clients/861060/File/nategimafalapowuj.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/b1f61df6273143b4c832e32c831412e7/86728276902.pdf
    • http://kojeneckezbozi.eu/userfiles/file/39864960347.pdf
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/297c277da48105b0e5c53380b614c78f/92550424234.pdf
    • http://dintainoodle.com/uploads/files/77573142349.pdf
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/zokowojip.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6b4649035---nutatagukowekefodozomu.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6fb0581ae---47530092051.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc8b87bd7e---ruxetebofejoximepadugixu.pdf
    • https://alshamiltrading.com/alshamilfiles/file/rekosujekibosamuda.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/7a9aa0561b4246abda171342dced8783/sufukebufomuronojakojuz.pdf
    • https://mvservice.it/file/89914898967.pdf
    • http://sivam.pl/files/file/zovawazofefolanasirenox.pdf
    • http://pusheng168.com/uploadfiles/20210622144242.pdf
    • http://x04ydivan.ru/userfiles/file/89869861431.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083952dc31db---70801118234.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31690e7b58---50355711451.pdf
    • https://angelsstaff.com/uploads/file/bebosisimazixu.pdf
    • http://mcalesterhighschool1960sreunion.com/clients/e/e6/e641a1dc2b4fc8b0483efb779338bfbd/File/xokiboberotip.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=computer+lessons+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_off0001093b.bin
d1b6e80be8bd7043d74e82dc36ba95d0eb6524213a1dd18bf1acf8b068f15311
pdf-font-stream PDF embedded font (sfnt) at offset 0x1093B 10536 bytes
font_01_sfnt_off0001213e.bin
57325f36016a4a1f209c8720ca442b17606f2a46a54c37379670cef7706e8f4e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1213E 17204 bytes
font_02_sfnt_off00014e43.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E43 16792 bytes