Malicious PDF — malware analysis report

Static analysis result for SHA-256 54592c2648f43045…

MALICIOUS

PDF

87.3 KB Created: 2021-06-27 11:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9a16494639aa7a22d74cd5f1505e10a7 SHA-1: e0e5ff13dfe508d29af0f8d4d35c57f6bfefe5e8 SHA-256: 54592c2648f43045720b7846c48c22f822710af55b62ebf589f594051f24bc6a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3695c07fc---92559114698.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8a1832005---monepufotas.pdf
    • https://kasihpaham.com/contents//files/rufivamusulovafep.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16086aabaa14b3---73913735661.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/e466618ee9c00712c2163f00a75c082c/tagamadubalimogulawuj.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074a773dc5e9---limatu.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/36e955b9ec0ad90bb6086c0cf68e9a7a/51196800514.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c23af30ab87---4182709474.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090035600243---zuzimigiguxufopevafupope.pdf
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/e303361a4b5d7e6b1e2ca5853953a327/kefovofolebamotibuj.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af87717b3d9---keduzekidum.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/09553bbed49ba90bf20a1f575c23aee1/43911035044.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16084b89d50646---juzosewesidenijerovawoze.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/kek3h82jora5h23ua3alcddmhb/tokurawexedifu.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/379cc2e3106884d8aa699007fe8fbe8f/47800914993.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ea7458e02---23975761758.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/75e86k47ldi3suk68hcrtraumm/tuduluxosutedatomadiren.pdf
    • https://amitadevnani.com/userfiles/file/kefoloxeweribaxip.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/1352f95775114c1f2358cd608014b48b/38852759165.pdf
    • http://jkmdc.com/aversystem.com/userfiles/file/10494288778.pdf
    • http://meadescafe.com/userfiles/file/worusu.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/v17ps9d7j40h7krr5ia5237reh/jenoxosuzinabafijotutewiw.pdf
    • http://mdbim.pl/ubezpiecz/obrazy/file/tefibikerubarifafefuk.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/f5029e1776d78d0d97b964103469286c/95977553834.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=extracting+an+image+from+a+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_off0000ef00.bin
6b76c7e2c7720f838abb38b941c62caf9e9d5f6eafdc0aaed01b791b9c6c7e7e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF00 10832 bytes
font_01_sfnt_off000107cc.bin
2932558ec3badc64687424eb297e8e2291c0cdb79bc590ec4d9973186601db65
pdf-font-stream PDF embedded font (sfnt) at offset 0x107CC 18080 bytes
font_02_sfnt_off000137d4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x137D4 16792 bytes