Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3984c3d47f74338…

MALICIOUS

PDF

73.9 KB Created: 2021-10-06 15:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb8a01edc1361c0a33a4b8c52d4c036c SHA-1: 407dd2b0c6f935ae850fcf6efbe6dab5d1cc5ff7 SHA-256: d3984c3d47f7433897ab15002b85b59bbae1ab31eddcd319c5fd81c346d4ca5a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the presence of numerous external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/l9ckafm4khplut8j44t2d7c8ik/48277947214.pdf
    • http://brmhn.com/userfiles/file/20210914053332_18bnt0.pdf
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/47145297143.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/1cb1cc9e585546a9e390ac7e68d375b8/zawobaviretamilebilogov.pdf
    • https://medicentrumnz.eu/medicentrum/files/file/60507094596.pdf
    • http://www.petersonassoc.com/emailimages/file/28203252218.pdf
    • https://pnlcoach.com/misc2/file/
    • https://abcoegypt.com/userfiles/files/tepepibapej.pdf
    • http://budaikepkeret.hu/uploads/file/kawafufatekozubogeno.pdf
    • http://creationart.hu/files/file/60399109934.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/41325942667fff5f87d0f876dac97cf6/gomosemabojiruvadose.pdf
    • http://energo-winstal.pl/userfiles/file/sezezufamuwegoda.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/1bbfc4fe289aaaff01661b4d441db7a0/7602384622.pdf
    • http://kaithompson.com/userfiles/file/ravejefowilabekenalejun.pdf
    • http://bluekeydigital.com/images/pic/file/3973860252.pdf
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/kuladiloxipedonirevo.pdf
    • http://halongbaycruises.org/upload/files/rujigamanuge.pdf
    • http://integrotech.eu/zdjecia/file/tozukanepusiropafew.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b32c8cb150---71849937951.pdf
    • http://jnnycc.org/userfiles/file/26037457031.pdf
    • https://tigaintan.com/contents/files/tuxivin.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/rn5ubp6a4q97besnmrc2e2cpcp/82425872331.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613380ba59150---68461642092.pdf
    • http://wisdomtours.net/upload/file/36866872849.pdf
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/21782522133.pdf
    • http://yuhongzg.com/d/files/83471591671.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+write+a+cv+for+construction+industry
    • 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_off0000bf10.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF10 16792 bytes
font_01_sfnt_off0000d727.bin
fba9e67630b32c9f0eb1a521b9cb834180ff8a97b0e0d9192c41d7eef42b76ff
pdf-font-stream PDF embedded font (sfnt) at offset 0xD727 10780 bytes
font_02_sfnt_off0000f02c.bin
b6813b5e45e9fe99bba6789e30863007c8777ee518793606af39939537530c7a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF02C 16196 bytes