Malicious PDF — malware analysis report

Static analysis result for SHA-256 842cba997030d4a1…

MALICIOUS

PDF

86.0 KB Created: 2021-06-29 06:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 71ff6affaabcf5bb463e48f400281956 SHA-1: 8ddb8b6024838a252ec109c088709d22432f2fe0 SHA-256: 842cba997030d4a1742bedd08f6a6c901cb7b204e2a8d665f55253a2f05a2df6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://garglob.ru/uplcv?utm_term=reflection+over+y+axis+and+x+axis
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e92a219fd---vawudavikadikoze.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/6be2f6315f18f5d096dee02cef6582b0/7329115250.pdf
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/uskoflps6mo5qm0e9k49tuf5e6/87856266185.pdf
    • http://sochi-polyana.com/ckfinder/userfiles/files/gawozufit.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c994b5f8e8---puvabavabelifewugefexi.pdf
    • https://permargi.com/files/galeria/files/vevikozutoruriven.pdf
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/db39db9e195b7b1240c4708907df08cc/47146302537.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/d623fa9e188f61342cb84d82fab69f3c/lowes.pdf
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/dovobibiwavepa.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607db0fb04c3d---88125466093.pdf
    • http://lubrifianti-auto.ro/files/file/muxutovajupetawu.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160706ed3edc0a---sapotozasilenotuwiwudufak.pdf
    • https://churchofgodinjamaica.org/app/webroot/files/rowomakigovaxobikevewel.pdf
    • http://dashoernerboot.de/userfiles/gazeka.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608751d5e6297---numipipizozifubidomivetu.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/vpg1sp2jbh6pf0pvjl7lr1as8c/72209253176.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/8e5bb1982f5ca469f974d2750239b77c/ditusapiko.pdf
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/7d9764ad5d746b20602bb600e2f58bdf/tufusezawiw.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607080b4d430c---92254129052.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080db8f7260a---lilepasiso.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/bf11c89cfbcb94e5cacb8ee6860dc2c4/20459261108.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cf6307ea6---wanomazemisebus.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bee81bb9a7d---97982218910.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_off0000e9cf.bin
4eb8a0d8ce6b02a20dd34ff6b170bf5adfac65bcdcb24142ed963ad4cb204091
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CF 17464 bytes
font_01_sfnt_off00011814.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11814 16792 bytes
font_02_sfnt_off0001302b.bin
339fb851b3eedd494d52c4a2d8016bfe71024175437a77a89819937e53d7a5ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x1302B 10796 bytes