Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b6de998e4007c7…

MALICIOUS

PDF

88.0 KB Created: 2021-06-28 19:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5094703ca165e00c49e58015f71a31f7 SHA-1: 852897083057f38bce131907db16532aedfa7361 SHA-256: b7b6de998e4007c7e7d86ed738c3b66052611e8a30b0b05a15291831579d525f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories. These links likely serve as redirects to malicious or phishing sites, aiming to deceive users. No scripts were extracted, but the presence of multiple compromised domains suggests a broad phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e34a466a1e---nosubipa.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f95f353caa---rewakuwujelidowat.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfde7632aa---38295685898.pdf
    • http://riskhedgetech.com/uploaded/file/181737531260c8d8eca1f01.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/ujt6cmll28qq374u4u8ph9b2pm/3357583967.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/e89d38f7bba7951c84a713cea39894d5/41018948840.pdf
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9ef415f35---9490388624.pdf
    • http://k-yoga.org/file_upload/spaw_upload/file/20210519100934.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/70e43cf869be8b7b4a96d67ae1579e2e/lowebozirokijokes.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/3a21d0d1e51478945d7c9b8017a710d5/zopijaguson.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/8f7ad6bf53eb8f64f26bcfa373044316/44847843127.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/48ceea15f6b171b4386bd49d810528a5/fojewepegiti.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075334a4ed49---67901952004.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac16d4baaaa---52993742183.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/5a7ca4f935f406a21dcd4e1ce178aa89/80589564030.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/3rs6agrhm32vnlkvrhvjftol32/vevumufebolafebilikapona.pdf
    • http://morethancars.nl/uploads/edytor/file/setipekufovafusiganafaki.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/trfdmemduhqfc939e1hd9glb11/tonavilawafijowonudixenok.pdf
    • http://auchli-appenzeller.ch/userfiles/files/lalubib.pdf
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/98163935881.pdf
    • http://files.ibiza-ferien.de/file/lojunejima.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609e832292e48---47253441285.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16086ec3c21a4f---walijarelupubi.pdf
    • http://studiobardinisrl.com/userfiles/files/82228598176.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846b8b171b4---32215201612.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=best+english+comedy+movies
    • 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_off0000f290.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF290 16792 bytes
font_01_sfnt_off00010aa2.bin
f7c54298f0daf78a3902c507f1d186a4efc518ed0230ecff7f91234ac4404e4c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA2 17484 bytes
font_02_sfnt_off000138af.bin
e9b4c76bdb531a3118749f2d67640442c6852ce73056d852011155c1d3547e04
pdf-font-stream PDF embedded font (sfnt) at offset 0x138AF 10788 bytes