Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cb1748881f561b9…

MALICIOUS

PDF

88.7 KB Created: 2021-06-28 05:53:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 796485bd6108ec7c49cc16577d1f60bf SHA-1: 51fe392253702d377787b5f994db84cc777eadf9 SHA-256: 3cb1748881f561b953794dba7e707fdb9c2f94aa165f750607fbcc1023643c42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of external URIs and compromised hosting points to a common technique for distributing malicious payloads or leading users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://garglob.ru/uplcv?utm_term=excessive+dehydration+symptoms
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdea2c63c6---xawofepogeburibeju.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/adaf3e9d18b64241497d310a6184d296/4291867993.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608260b5aa7c0---ruzalavubiritosuz.pdf
    • http://personnelstrategies.net/userfiles/file/37017340308.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/4mr9g788u805eu203rdflhtqfh/7794391541.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/7183orfkgdmbn3c75p7jao8cid/muwiwen.pdf
    • http://nanoscopy.ru/uploads/files/vunukugipil.pdf
    • http://aj-logistics.com/stock/userfiles/file/rabegepamixupefadujema.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a263b55e3af---maxawowigorovuwabozapa.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3bc63dfdc---duzix.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160925c38a389d---32451751876.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091fca19edfb---69298339192.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/fewexinosaxalefipazu.pdf
    • http://inventory-acepipe.com/images/uploads/files/84954847219.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/f9b980de0329e4ffcc7e35093c69370c/sojawazogi.pdf
    • https://fedico.ca/upload/editor/file/sajutokotoruluguwolevim.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/317e7cbcd6bac8b5747028f476f495b9/78888038947.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160940baa6d9ce---jebenixitugawin.pdf
    • http://sshs1962.info/clients/3/33/33dcd814b32da85629335a95ab3d0158/File/vakozaselejizelirubewuna.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/d3f668fff9d9e25b37acf46ab457f513/tusopikavini.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ac67c66adf4---bijeleliregafojepo.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d32a5b328c9---bidasojegemevusebulibagu.pdf
    • http://tokyoto.pl/UserFiles/file/tevisadozarijadaza.pdf
    • http://fujavietnam.com/images/Download/nikuwa.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/93fc2009be2469fb85cabf3d75837fd1/75358779047.pdf
    • https://baxsporthorses.nl/userfiles/file/jelofazolatufasibifif.pdf
    • http://homenet-spb.ru/userfiles/file/9223651546.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_off0000f99e.bin
ad7fb2bfa2edc5508bada9353b3c64382b1f1d67d724cd257e4cdced977f923d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF99E 16264 bytes
font_01_sfnt_off000123b7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123B7 16792 bytes
font_02_sfnt_off00013bce.bin
2eb09ecb4ff39ec57b1ec9d453203adcdbb8f889cc9b1f346e2d1b0983b02950		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13BCE 10996 bytes

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