Malicious PDF — malware analysis report

Static analysis result for SHA-256 9da77d198b563760…

MALICIOUS

PDF

85.9 KB Created: 2021-06-30 06:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6ffcd64622ba7197c728b60830c6ddac SHA-1: 42e19ea1a8037980602734eace67c959f4457880 SHA-256: 9da77d198b5637607b5945e7342be0b9aeed5ebf44f264c8b3780e10e8c3b749
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cec60b0e5---65249350342.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b95b7de2f3b---86940634583.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/a3e0ffa495baff722f86e861aa6df434/mejupajopopedulukewamu.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-6-27/20210627020431193608.pdf
    • https://birudongker.com/contents//files/tujiponamixovudawuna.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/34e9d3ffc8cae7301ea790816e8fb782/94839752822.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e478920647---76554422939.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b47cee61470---foxodibifu.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/r93tcpqpu243l96cpmr9r6u2r5/60992560031.pdf
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86107659245.pdf
    • http://dongfangguohua.com/ckfinder/userfiles/files/tijegaz.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607945d656c9d---kexun.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16092798d88592---xakugevizatabawer.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16090dc09c32a5---lafotufakunazojorokiwad.pdf
    • https://angel-juicer.com/FileData/ckfinder/files/20210604_B44D277963B9F84A.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/c39480de39a6e615822d37a0e40c79ca/2694749739.pdf
    • http://busanpc1.com/upload/fckeditor/file/61653884732.pdf
    • http://abacusnancy.com/userfiles/file/xegegiwelolosokilosomut.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882b3bc45a5---83977804970.pdf
    • https://anukulagrotech.com/userfiles/file/97331112150.pdf
    • https://bomberosdenavarra.com/userfiles_nexo/files/21256748180.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/c9e83663ef61ee193aff6635d5b54c1f/nonefabilukagep.pdf
    • http://adria-ex.com/images/blog//file/50422849949.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=photoshop+cs4+free+download+full+version+with+crack
    • 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_off0000ebf8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF8 16792 bytes
font_01_sfnt_off0001040a.bin
03701c170497c825787faa4175cf6255475b2255a72a2e7c3cea3a83a739d520
pdf-font-stream PDF embedded font (sfnt) at offset 0x1040A 16872 bytes
font_02_sfnt_off00012fcb.bin
3a58f7475e0f8014c1e9ddb27e06eb10e66c9cb1d78d28e9381e4ed7f8c1fbd7
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCB 11140 bytes