Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce6c45cf75a0c398…

MALICIOUS

PDF

90.4 KB Created: 2021-06-29 10:41:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a21d535e674d5c9b118f3b816b8b333b SHA-1: d2af733ff46d3a569fe9ff2af381d83bd56b9b74 SHA-256: ce6c45cf75a0c398da33ed2da71dbf1102495695e24c9f1d59233bb3a4e0afc9
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier. Heuristics indicate the PDF contains a link farm hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The embedded URLs point to various domains, many of which are associated with compromised CMS uploads, indicating a pattern of using vulnerable web infrastructure for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160946124bc2de---48931383537.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/dc72c5dac53736c59470ef463a0a2ff3/womutirowifiwokut.pdf
    • https://giolog.biz/images/bulk_images/files/35335791805.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd340c5154a---pigemedasu.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/1b6e1f67821e6ed93f6ac000d5dea7f0/ranozujofofixito.pdf
    • http://taiyoaquris.cn/upload/userfiles/files/20210618084721.pdf
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/7mp836lrrsqqsf6fuuqun6efd3/56865247674.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6cd709bfef76ae142177c25cec43579c/56580976664.pdf
    • http://driver-jazda.pl/upload/file/wumexonoxeriwixit.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16099ccc3ce656---5332047124.pdf
    • http://szkolka-wiercioch.pl/files/file/wigijawogexo.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/b735ce69b44ff30e5d6974f0e5a1def3/tasujo.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/neoqdrmi50eqc333r61b5cqmc3/50572371048.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3aa5c374cc---wagadopolawerizo.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/8jmi389m3ajsqfc1dgommgns4o/doxivowisiragotegoboxete.pdf
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210622192044.pdf
    • http://0-50.ru/userfiles/file/vomagazididakipu.pdf
    • http://weingut-suppan.at/files/10067097137.pdf
    • https://publicbridge.pl/userfiles/file/gefokodariwigilubisosedon.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/aq4sukhh7t341jd7tpe9eck7fh/64174431168.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb39fe4210c---vubagabavutowigakapasorod.pdf
    • https://menu2uplus.com/images/file/rufizezugevi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=angular+component+without+selector
    • https://angular.io/guide/styleg
    • 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_off0000fab7.bin
229fb36eab3362ead7d8c7285689d8c816b601a19de205f121d9d5761e07e56e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB7 10988 bytes
font_01_sfnt_off0001142e.bin
6b7b711f11c5de27bab6f70555470e05746c0f4ad0619c8938b97950178900de
pdf-font-stream PDF embedded font (sfnt) at offset 0x1142E 18204 bytes
font_02_sfnt_off0001441e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1441E 16792 bytes