Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ff047643ccea3e…

MALICIOUS

PDF

83.7 KB Created: 2021-08-08 14:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 916956442348611a0280af1f6b4b42d3 SHA-1: a5c5e009639cb440193c6235749b627b19f3a8c3 SHA-256: c8ff047643ccea3e3a63a4df7138cf93444c042e92c413ec2aa43eb9eeeea5a5
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and exhibits characteristics of a link farm, with many pointing to compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading malware via the presented links. The presence of a 'download button' heuristic further supports this phishing-like lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://wastran.ru/uplcv?utm_term=how+to+install+crazy+craft+4.0+on+xbox+one
    • http://iaestedresden.de/userfiles/file/vijamokepajogorekowax.pdf
    • https://inncredel.com/uploads/52163647799.pdf
    • http://lt101shop.com/userfiles/files/1594604315.pdf
    • http://cymagun.com/userfiles/ziropexamejudagujeroj.pdf
    • http://mkpstroitel.ru/upload/files/76352882231.pdf
    • https://vanchuyenduongsat.vn/upload/files/27961843470.pdf
    • http://limoride.net/gallery/file/zixazovav.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba8abc505e---fetuwa.pdf
    • http://savitapiti.org/ckfinder/userfiles/files/jedotepelaxexuvaxutiloli.pdf
    • https://sharjahcements.com/images/bulk_images/files/kewofir.pdf
    • http://dolphinegypt.net/userfiles/file/56071974891.pdf
    • https://twr1115.net/files/fckeditor/file/665547747.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609850f2b6453---pabufe.pdf
    • http://e-cluny.cz/UserFiles/file/67971399484.pdf
    • http://1mosref.ru/ckfinder/userfiles/files/pevuderavaragufetivomepo.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/9mhoubri88nelvn43vd1i4hqd1/kozuvobepi.pdf
    • http://abimobiliare.pl/pliki/File/nowezakoniwefesetegu.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809d669e152---sufot.pdf
    • http://bannermaul.com/userData/board/file/ninosexekibixo.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b73cfd6a50a---supepali.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/03d2b134c7c40c6708d8dc2d8471c51d/75323612415.pdf
    • http://jmvlpslimited.com/ci/userfiles/files/29152999073.pdf
    • 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_off0000e227.bin
f08bdcb1418d82fb8c12bdb5d19523f73e0eb63865b67f7a44e34a40d7b27dc9
pdf-font-stream PDF embedded font (sfnt) at offset 0xE227 16924 bytes
font_01_sfnt_off00010e05.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E05 16792 bytes
font_02_sfnt_off0001261c.bin
685bd36a73f5d9f699bd96e10951f3a4dbb03af299b673f89c9d2affa4585493
pdf-font-stream PDF embedded font (sfnt) at offset 0x1261C 11088 bytes