Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae6926f503c55248…

MALICIOUS

PDF

80.4 KB Created: 2021-09-17 18:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1eca9102e4cb45bd3caa6bc3b3280549 SHA-1: 58ba138e5ec2cd256f99e7211b984ae616de11cc SHA-256: ae6926f503c552483f4b3e94e0328b292f994c40836cdd5ab6266e0db96f0650
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://aolisenjiancai.com/data/files/75138037493.pdf
    • http://snsi.jp/image/news_file/97588816705.pdf
    • http://ekvatorbl.com/userfiles/file/30793469827.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/ef4532c739c86dbb5ecad6e050b2c748/93689656045.pdf
    • http://papianiarch.it/userfiles/files/lipusorumevilupozel.pdf
    • http://clinton.abwingsmd.com/uploads/files/24780817542.pdf
    • http://paglialonga.it/userfiles/files/77458587354.pdf
    • https://saleskerala.com/ckfinder/userfiles/files/xenevuvupemoxini.pdf
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/18177822627.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161412d07114c3---zalometifuwamedowalakam.pdf
    • http://nmways.com/uploads/fckupload/file/36695941702.pdf
    • http://weighlessthisyear.com/ckfinder/userfiles/files/nuteworamijejiju.pdf
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/kezezapagani.pdf
    • https://e-motorcycle.tw/upload/emotorcycle/files/53718461049.pdf
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/metiwakelefiw.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b50bebf787---63731922689.pdf
    • http://medicare-darmstadt.de/bilder/UserImages/file/busudoriponapogakirez.pdf
    • http://sun-green.eu/ckfinder/userfiles/files/93402022913.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=what+color+do+you+get+when+you+mix+red+and+purple
    • 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_off0000d5e4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E4 16792 bytes
font_01_sfnt_off0000edf6.bin
c2a8e53562892b36480c64d12a085839a40cfd76347354a57df027b7aa7c74df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF6 17060 bytes
font_02_sfnt_off000119e0.bin
19fb4894a6afd925126e913f115eb22b087929f6e96bc83c7ddd3bb146731272		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119E0 11188 bytes

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