Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1e5f4a1d2d8b9db…

MALICIOUS

PDF

75.9 KB Created: 2021-08-08 01:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 747cfe34726e46e0aee135c1949d0d78 SHA-1: 437b74a77c1e2a369d10c3c81c5320e0114ae109 SHA-256: d1e5f4a1d2d8b9dbd66d7aa28fc9ac8e0fc3fe493853b744d6bca373944fa4f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://archism.ru/uplcv?utm_term=grover+dill+and+the+tasmanian+devil+questions+and+answers
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a638163ed89---vazagapojelujogitowazomez.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb586ae10f---bidarosoxemi.pdf
    • http://bliksis.ru/userfiles/file/zadufex.pdf
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/70732778309.pdf
    • http://krugernilssonreunion.org/clients/c/c3/c301050bdfa85653d7453904791897ac/File/miwatobekasune.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f4ef55b6c---kabuwoxifebazunutemapabav.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/t1r4h06i4860f8m4ntalns1om2/60143180069.pdf
    • https://avonsteel.com/UserFiles/file/nizepabidavow.pdf
    • http://vizugy.hu/uploads/files/12189671170.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/dc31463ba344fa89663821d5661db63c/bagakarufufekewapudiro.pdf
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/digagawitigejamozikamer.pdf
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/52510037913.pdf
    • http://aihyang.com/userfiles/file/15611982324.pdf
    • http://tahi.hu/ckfinder/userfiles/files/dogarita.pdf
    • http://willismctyeire.com/clients/c/cd/cd1fd5262213d36872a77bd42df049b7/File/15875381136.pdf
    • https://chp-travel.ir/data/file/lozojemavafanukupegizuja.pdf
    • http://niestachow.pl/data/aktualnosci_imgs/file/vesipuxewexudokozuxeluduf.pdf
    • https://steklo-shik.ru/userfiles/file/dumokakutebidavobituvima.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4522bc0f5---guwuzifomire.pdf
    • http://namuvaldymas.lt/userfiles/file/40052742968.pdf
    • http://moscowprice.com/content/xuploadimages/file/wenesoz.pdf
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210727_034916.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/7b1e8c2d02ab3249a8583196c25285b4/16482147778.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/v97ndgbpimq5n65gl3sjgcc6o3/someja.pdf
    • http://medicaldistri.com/ckfinder_files/files/45262382962.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_off0000c5a6.bin
e002a604dfe02a1139449f3a116712e907da497e7366f1e8cd476290a7ec259b
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A6 10948 bytes
font_01_sfnt_off0000deae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAE 16792 bytes
font_02_sfnt_off0000f6c0.bin
066817c9da45943e2cf1a83ac5a6de3d54113b9383654b23f48e374b7987b6e7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C0 16312 bytes