Malicious PDF — malware analysis report

Static analysis result for SHA-256 940883afb510a32c…

MALICIOUS

PDF

69.4 KB Created: 2021-09-27 00:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 30bd49f11fde571c2d5bc266c97fc57d SHA-1: 15d693d2121ab2765465db3be92f60837d345ae0 SHA-256: 940883afb510a32c6e9f7d221942a5c938a982b8c0a54bdc2ff6c6d189cca392
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised websites and potentially disposable hosting, with one URL specifically mentioning 'ps2 emulator android apk free download' as a lure. The document body is heavily obfuscated and unreadable, suggesting it is not intended for human consumption but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pistant.ru/uplcv?utm_term=ps2+emulator+android+apk+free+download PDF link annotation
    • https://global-brand.net/userfiles/files/gemujizurutidoxol.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee47a28808---84729500087.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/82037679589.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/domed.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/19860001218.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143c1fe522f2---41823318003.pdfIn PDF document text
    • https://branpc.in/ckfinder/userfiles/files/35147174931.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/norevoxuzuvofuwisigaw.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/442381493.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16143dfcdafd3b---55485582712.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/88125508357.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/89bbcabd72a33253fea0e86af239f41a/nagalijaxifizusin.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614230d549fd2---mativexiketefimubizatex.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/komobirulas.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/zamofudupevezimuxosekugos.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/17213901381.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/38273444231.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/65831213137.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109041256306423.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/zizesorivepewupabenejus.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/4741754723.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/nuwamafodig.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/61438da50ad1f.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC744 11060 bytes
SHA-256: 579754854740d67ade0dbe6392c676b33a49ca66f852e7c24ecd91374593f9a3
font_02_sfnt_off0000e120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE120 15292 bytes
SHA-256: 1095be9efab96af056a14a9294add234c61dd683aeca7c3e39e0b386f554ecf1

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