Malicious PDF — malware analysis report

Static analysis result for SHA-256 e00b574936ef034d…

MALICIOUS

PDF

86.4 KB Created: 2021-06-28 15:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fd1e45ea0c411a81bc2fccf498c45197 SHA-1: ff5ebd05145abb5734b42b0a429830352925e9f6 SHA-256: e00b574936ef034d43be16e74b3586739a2566497c9da98e8dc57bbf0f6b76b6
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 CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as phishing or a trojan. While no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://paymentor.nl/uploads//file/81624923645.pdf
    • http://ansonseatery.com/uploads/files/46858528600.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d74590dd45e5833e973028375343c81b/fasepojuli.pdf
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/labokebibumefokolaxe.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/3gbp15m8338v0h05n3lcuskmru/pipixirifirimereniwa.pdf
    • http://zaun-produzent.de/userfiles/file/29952595683.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e31f1ed99b---94649629298.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16089334c77c1d---78667076224.pdf
    • https://juhaszautovill.hu/userfiles/file/lajij.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/fbovd6f441uh7mngvsnuvpn5en/80131555581.pdf
    • http://backkwang.com/userData/board/file/zanusozojuwomevig.pdf
    • http://bestorkate.com/uploads/ckeditor/files/85213129678.pdf
    • http://csc-0898.com/userfiles/file/20210627115552_jp55p2.pdf
    • http://changju-hotel.com/CKEdit/upload/files/10383782564.pdf
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/8040320206.pdf
    • http://beijinghuojia.cn/userfiles/file/vipavovise.pdf
    • http://np-laser.com/upload_fck/file/2021-6-26/20210626094254149697.pdf
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/ff27204f273b75ce11be29a93c133e23/xudufo.pdf
    • https://avela.md/userfiles/file/33464046277.pdf
    • https://cengilli.com/icerik_images/file/71039586052.pdf
    • http://kapli74.ru/upload_picture/69655125545.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c690884e17e---mojuliwapegirugadoxepuzes.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608351f458b9a---turavop.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/adfc93b57cff876aee09eb31b6a6ab7f/93345563851.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=mouth+odor+solution
    • 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_off0000edea.bin
6e82cb5a1c4694b90168a21ccc804dc61aa8c9cfd18963cfeda2407dbadb1ef1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEA 17652 bytes
font_01_sfnt_off00011c54.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C54 16792 bytes
font_02_sfnt_off0001346b.bin
b6aaffe54edbbed349026e952114432483092fbee217ccc0ae2579dede418cab
pdf-font-stream PDF embedded font (sfnt) at offset 0x1346B 10144 bytes