Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1c4bd40539f6e6a…

MALICIOUS

PDF

102.8 KB Created: 2021-07-08 10:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6d462d392060972d75ad5ea49797d17d SHA-1: 9e6531528efec41bc0d84db707c56ce76f6c26fe SHA-256: b1c4bd40539f6e6abcf36ecb5d77924e84d2d1d36dc7040fc3005e50bc1789e5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous external URIs and link farm patterns, suggesting an attempt to redirect users to compromised websites or phishing pages. The document body was unreadable, but the presence of many links to potentially compromised WordPress upload directories indicates a likely distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9767

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://crewmak.ru/uplcv?utm_term=withdraw+meaning+in+kannada PDF link annotation
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070258d419b8---dokajonamewalimuwedos.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c90e22361b1cffd954789079629fea7d/zedaniwujagupevezez.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073f87328d1b---46957131444.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/dffa260a13a1472d0c42f5fe5f7f830f/devux.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/5kqiav65o7b3kv325keml5vail/jirejudawiwuzobuwolegawu.pdfIn PDF document text
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/pitekubafodiv.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/suruxopixuvosuvok.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b4f56e41b---jisubuvitokofimikumepu.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/8419541974.pdfIn PDF document text
    • http://pinxedien.net/upload/files/78261480699.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a01c84b49---99812043488.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a41d54ba3e8---wutuw.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608466c7e2fa9---60275412551.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/kuxebovexijiwixiwoxix.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/ed3ec6a8e3cf7c49c90e36fcd763dcde/vagepebegaragavofijeto.pdfIn PDF document text
    • http://fiscalonline.eu/app/webroot/files/userfiles/files/8042974037.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607925bc41bb4---91887355951.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/c770f334242aee0330b6303dd6419924/69894416079.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/6774254ed7f9f17d65dd669f27ae3f66/75007025238.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/od4oo8s0o8dla87d1357562poo/nasorumeborofi.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609113c096eae---67073375581.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/38692184239.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/7nap0j4aqkr8cpqqfas6pqspe6/basepodamizik.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16074723b6d92c---totujategiperulefusosupol.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/57a7f288275c18cb11dbdfeb4c3926ff/57076699876.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000e677.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE677 19380 bytes
SHA-256: f6af318afa4766231db9d3ce81f55a096e90914c83d1a3c92e1e5a31b0611bf6
font_01_sfnt_off0001076d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F84 10532 bytes
SHA-256: ad13d5ee2514c3105a0dc862181475a60e347167d491b289d3f92caca03aa63f
font_03_sfnt_off0001371a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1371A 27044 bytes
SHA-256: 8dea905817b60f172487d67a685bb3707bef253b4ca551820e1f433097648ab0
font_04_sfnt_off000178cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178CD 5728 bytes
SHA-256: 32c19a60b45c00a5b14e71a5a60707ddcfc180901677caa04c35ab42aa690800

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