Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf9ec9b836055d25…

MALICIOUS

PDF

78.9 KB Created: 2021-09-07 16:32:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d1186868602fab2d4db3dd7d9c96810d SHA-1: 7b20f6c52b67ac77fe5f61df3112fc72e01f2b4b SHA-256: bf9ec9b836055d2599359acffc5afaa0be3804bd3d68e1675b64145b0bd84e48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised CMS upload directories, a common tactic for hosting phishing pages or malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://campbellelectronics.com/uploads/83845778758.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb8899a176---dazotejizum.pdf
    • http://dr-onesrl.com/userfiles/files/sofefovebabiledaj.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/5e961eafef59448f4e00cdfd934184f1/35730824109.pdf
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb46233303---xosazipezewefuvarita.pdf
    • http://yomamasushitogo.com/uploads/files/19582849797.pdf
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/32c680dea1f949cc1735b121be9de6bb/zupiko.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd0f2ccf0e---23991432768.pdf
    • http://pp-aqua.com/userfiles/files/57055144787.pdf
    • http://apsons.eu/files/file/kinuf.pdf
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/94245567316.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/78779887844.pdf
    • http://bajajsports.com/userfiles/file/32280341959.pdf
    • http://andrelandberg.com/userfiles/file/serilunibexar.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747f8d143a3---84831917650.pdf
    • https://vildmarksjagt.dk/userfiles/file/61480017594.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/2575490bc002916dd189a9041de22192/zukinus.pdf
    • http://bakoca.hu/files/file/45979197290.pdf
    • https://ecpa.fr/uploaded/file/45486001625.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077270151c58---pizadanow.pdf
    • http://lev-steklo.ru/userfiles/file/melosodirexiru.pdf
    • http://twothirdsmajority.us/clients/38522/File/21187268562.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/c243b030d92b55adcb940b39564a02c4/14102663638.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835fe78e245---50030007324.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=ohaus+triple+beam+balance+2610g+manual
    • 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_off0000cb6c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6C 16792 bytes
font_01_sfnt_off0000e37e.bin
ad7eec744ea065004636428615b37fd422c0a402edb7be4fcc1b6a2654d133f4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE37E 18364 bytes
font_02_sfnt_off00011323.bin
bde2eb67ad1e263831b7d1bec896a681a884ba47f04d32cbcc88be1a0018a2ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x11323 11428 bytes