Malicious PDF — malware analysis report

Static analysis result for SHA-256 02f53aa06260a05a…

MALICIOUS

PDF

88.0 KB Created: 2021-10-06 04:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 06d877588921799dd64db958c39ba32d SHA-1: f7c604e67a9b008985a0a1b4fb30b26f06a814f4 SHA-256: 02f53aa06260a05acb039848627d839e2617428f68ef7d19dec2b683910b4a1e
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the overall structure and URL analysis strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://orderkai.com/uploads/files/larabofizofojox.pdf
    • http://rujiahk.com/uploadfiles/file/fafoxavuwuriwuf.pdf
    • http://wmasgroup.com/userfiles/file/95667925727.pdf
    • https://rajatotogroup2.com/contents/files/kesomanorudak.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d2e81c9c2---71049774544.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/c4afc93eef210dddf32e9c102194e977/63954339388.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16156331978472---81181832022.pdf
    • http://werkschoenenverkoop.nl/images/docman/files/29718219105.pdf
    • http://studiogeologicotrilobite.com/userfiles/files/86089430275.pdf
    • https://pakistanchristiancongress.pakistanchristianpost.com/userfiles/file/fetoxedegakusopetavewe.pdf
    • http://msnladyboy.com/ckfinder/userfiles/files/24972689470.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615963010a24c---83802934140.pdf
    • https://peiitw.com/Upload/ckeditor/files/95702451933.pdf
    • http://www.mousumibanerjee.com/fckimages/file/komusizik.pdf
    • http://bowie.abwingsmd.com/uploads/files/wetakuxalik.pdf
    • http://knshzj.com/CKEdit/upload/files/bufodez.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/40fef24710d62a507bd35f4799d3c64f/67416928904.pdf
    • https://perfecthospital.org/ckfinder/userfiles/files/90665673624.pdf
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/84138343658.pdf
    • https://dollarplus98.com/images/upload/files/51878082333.pdf
    • http://vidol.nl/userfiles/file/bafukerojidulinej.pdf
    • http://martonelektro.hu/files/file/nixikanixip.pdf
    • http://ativn.com/upload/file/momaxugipifale.pdf
    • http://sanraimundo.cl/dyn/uploads/file/gejabadureloxirubudaxufu.pdf
    • http://officeharbor.com/pdtInfo/topopalela.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+turn+on+led+backlit+keyboard
    • 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_off0000edf1.bin
acc6955cf4d42cbb63585920b7cb51605344aac48a6e8495436d2d16fd4dc992
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF1 10720 bytes
font_01_sfnt_off000106a7.bin
fc996d8f4d9e3f6e55066c03b9b595ac4c99cdea03cae9dec772d56e0e899140
pdf-font-stream PDF embedded font (sfnt) at offset 0x106A7 19496 bytes
font_02_sfnt_off000139e6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x139E6 16792 bytes