Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fb8988e2d35dd8b…

MALICIOUS

PDF

82.9 KB Created: 2021-09-18 02:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 23ffe3b72c4079ecc44fbad88caf1742 SHA-1: 21028489ab6d86c8fbf90bc505c9950b3ad43857 SHA-256: 6fb8988e2d35dd8b1d9fab3746ae78c2b4bbf35c8008eab6b3d4ee723867a98b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1071.001 Web Protocols

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://aqcorth.specialty-match.com/upload/files/48954270723.pdf
    • http://pusancard.com/userData/board/file/megunizekarilixofaku.pdf
    • http://frankifoto.com/uploads/pages/files/10652738207.pdf
    • https://noelex22.org/userfiles/file/40513311407.pdf
    • http://targhevaticane.it/userfiles/files/40577368463.pdf
    • http://progettogeometra.it/userfiles/files/zexafezomufadunevodog.pdf
    • https://truckforceone.com/upload/editor/file/tavuwirojamuzi.pdf
    • http://af.ssla.ru/images/fornews/files/40460693054.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613494542f68e---soxibuwodu.pdf
    • http://daiichilogistics.com/uploads/news_file/8887720877.pdf
    • https://truckforceone.com/upload/editor/file/44984565444.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/b8afefbebdb59e31f390f0d3b2b838fa/mizisowisizevarotix.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/58bb8b2bb9cab75d12971f07c0d59577/vezaremix.pdf
    • http://iraneto.com/basefile/iranetocom/files/58195650831.pdf
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/tubutimozexefivokukipu.pdf
    • http://esistore.be/userfiles/file/37314425115.pdf
    • https://scalper.ir/data/files/file/89427555739.pdf
    • http://ferrogep99.hu/static/media/file/dilitaxowagozugu.pdf
    • http://tea-ra.com/user_data/upload/save_image/files/jumun.pdf
    • https://plewmal-d.com/Uploads/files/pobukilomi.pdf
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/29808802170.pdf
    • http://pbpharm.com/upload/files/18215184584.pdf
    • https://digireg.ru/upload/97247232650.pdf
    • http://studiogiovannone.com/userfiles/files/68411118293.pdf
    • http://smartickgroup.com/userfiles/40622982319.pdf
    • https://playworkspartnership.ca/sites/default/files/file/24974372222.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=game+attack+on+titan+mobile+offline
    • 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_off0000e113.bin
d1e0dbe9326de4b96e3d18f937fa1bebeab3d6c0cfdbf9991c7fbf23dcbbd16f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE113 10500 bytes
font_01_sfnt_off0000f8f6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F6 16792 bytes
font_02_sfnt_off00011108.bin
72d8be0daa05eaccbda5527a5e8646f320d15f19c97e2ceb01a140725f161633
pdf-font-stream PDF embedded font (sfnt) at offset 0x11108 17192 bytes