Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa13493fe7b8cc61…

MALICIOUS

PDF

70.3 KB Created: 2021-09-26 20:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 99ea75cd465d59f74a668142d1194f27 SHA-1: 47aa7832dea3714176e62de1c0ab623f5333c5eb SHA-256: fa13493fe7b8cc61dcd8d00cea5f22f3a4e292d2af52e21fdb77e6223a1122be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with multiple URLs pointing to PDF files hosted on compromised CMS uploads and disposable hosting. While no scripts were directly extracted, the nature of the link farm suggests an intent to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://chinalabware.net/d/files/rovemopejonewizedaxitu.pdf
    • http://sdsenlex.com/upload/files/39010771385.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/5sgcneqg53mdtdm1jg74ajddj1/10259635515.pdf
    • http://fishingas.com/userfiles/file/rurapup.pdf
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nedage.pdf
    • http://redondoclassicburger.com/uploads/files/57673990865.pdf
    • https://nuttydog.hu/ckfinder/userfiles/files/ponogejap.pdf
    • http://myphamhelios.vn/luutru/files/57581848292.pdf
    • http://rotang.net/userfiles/file/22883816324.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/8bec4336805d4749afc283bda12e7574/30609768410.pdf
    • https://el-tall.pl/pics/file/9954850258.pdf
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rixefoditove.pdf
    • https://petikdaun.com/contents/files/64675220502.pdf
    • https://superchills.com/userfiles/file/94698083620.pdf
    • http://monthclean.com/uploads/files/202109190606076949.pdf
    • http://villalapinetafavignana.it/userfiles/files/zegisomezajekifusumak.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614af179ca009---vomuvuzovifuxole.pdf
    • http://sns-russia.ru/userfiles/file/76621983301.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614e74d2d1a84---57479376793.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f67c5a9a3a---wikale.pdf
    • http://qianlong99.org/ckfinder/userfiles/files/nufabavolitadefipomexar.pdf
    • http://studiogiovannone.com/userfiles/files/56547754079.pdf
    • https://viscom.bg/uploads/wysiwyg/files/befunijeborotovasirezep.pdf
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zalufetumevuribipuni.pdf
    • http://clinicaveterinariacene.com/userfiles/files/20937809948.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=gta+file+ppsspp
    • 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_off0000b1ba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB1BA 16792 bytes
font_01_sfnt_off0000c9cc.bin
fe948f95cb2703cf4b22c666f36dbcb28b140c59b9d5c55994ed1ad5b7f7b102
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CC 17068 bytes
font_02_sfnt_off0000f55e.bin
a6abc029d17e8f1900746f03b3203a70d8a3d25ac346697bd5122c76a2d8c2a7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF55E 10064 bytes