Malicious PDF — malware analysis report

Static analysis result for SHA-256 643258794cb02b5f…

MALICIOUS

PDF

78.6 KB Created: 2021-09-03 08:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 45a4951cacac73f3fdd644e68ba29013 SHA-1: 407a5fdef03aa2a01f77d5fccea01d584965f45d SHA-256: 643258794cb02b5f0773f0c444b5601599119d70a1406938d528fbbef820c065
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/16290872977.pdf
    • http://eskuvoiiranytu.hu/blog/file/noluzuwuvudidokama.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/66216356e39be390a0d98bb4e1a79502/49877854019.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac117c44eb7---bawuzomivamuji.pdf
    • http://stickerbarcode.com/file_media/file_image/file/tenadeba.pdf
    • http://ikkosushi.com/uploads/files/bakov.pdf
    • http://rapabzenec.cz/obrazky/files/25365173310.pdf
    • http://driver-jazda.pl/upload/file/voguduzovojulimotilelijub.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/dcc40d03ac3ef7ed0c0e1a8a1c7fd7cf/24088674237.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/7f169384ea1fa19998078eeb25abec75/93383738522.pdf
    • https://ustunbilgisayar.com/userfiles/files/20667981955.pdf
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/vomojopivajofavamusa.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16081123f756fa---7875160479.pdf
    • http://sakaryakasaplarodasi.org/userfiles/file/kebek.pdf
    • http://myucmas.com/userfiles/file/60017506467.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/d8113abd1b46504c9f043ba9ff52b6e2/47243903379.pdf
    • http://sintellect.ru/Repository/file/nekurevinux.pdf
    • https://epponline.com/mentorfinancial/page_images/file/basalitadagafotananegumu.pdf
    • http://yossy.biz/userfiles/file/vasebuvofesavubijadamow.pdf
    • http://we2meeting.com/ckfinder/userfiles/publics/files/wasabiwigumarude.pdf
    • https://vatlieutaphu.com/upload/files/kiwepubajad.pdf
    • http://tramtronbetong.com/uploads/userfiles/file/tadije.pdf
    • https://ikima.fr/uploads/file/votijinoxukenesomabexuzab.pdf
    • http://meruzhankhachatryan.com/app/webroot/files/file/lopije.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=mechanism+of+labour+pdf+download
    • 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_off0000cda7.bin
058fdf91a6ea7d0955a0cf966d10156ef420b0143b2c71aab74d7b238dfeb340
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA7 11108 bytes
font_01_sfnt_off0000e723.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE723 16792 bytes
font_02_sfnt_off0000ff35.bin
8d4d94797acdca96b22824d63ded95a46fef532b291bdf63289176ceb418090b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF35 17884 bytes