Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca9e0e4d1417f8a…

MALICIOUS

PDF

98.6 KB Created: 2021-09-03 07:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f948a6271f82b0532d3f05e8151103b SHA-1: ecc1c0056ed41df64dac8a819586d927aa4d0249 SHA-256: 4ca9e0e4d1417f8a3a978d57a97bf173c93c0f7821a05fb485f47785f2e1c6fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The primary goal appears to be phishing or distributing further malware by leveraging these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://catamma.ru/uplcv?utm_term=torre+de+belem+historia+pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/b555e7bae8202a7493c7d6e8281bd236/87353548845.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/508a784cc23aa829e39f2bfdd05a0ca6/15734163750.pdf
    • http://bajajsports.com/userfiles/file/zufepasupuro.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612951b923d14---vamavovogibexekagaropiba.pdf
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/27829833382.pdf
    • http://matras-devison.ru/upload/file/89400123443.pdf
    • http://www.hydro-tg.pro/upload/file/zeduzekaxejip.pdf
    • http://chingyi.tw/userfiles/files/religidasi.pdf
    • http://www.saito-ken.jp/userdata/file/61856809663.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16102b2984dccc---6629897748.pdf
    • http://pc75.net/upfiles/file/1624263508.pdf
    • http://9meclinic.com/ckfinder/userfiles/files/tezilonebubufotebu.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/161237f5502eb6---zafodopuxotufexuzazukobat.pdf
    • https://bepxuyenviet.com/upload/files/92793199228.pdf
    • http://kebirbeton.com/userfiles/file/fujesut.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c31975b7e3a---30267623737.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/35a166557857c7d6c274c2433cd15dae/30730854632.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cde5c5647e---xaniravetabafazofulojot.pdf
    • http://enjoy.sk/editor_uploads/system/files/93004991883.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16109146152c36---18215348503.pdf
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bogovobutomalitedetabaram.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/24466067009.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a613b86e1ea---86066797812.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_off00011423.bin
fe78b121e2c725ba393eb193074fdf2c94709d1ef801105b7d934091e453c6b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11423 10760 bytes
font_01_sfnt_off00012c9d.bin
ffd57b5ed191afb0033bcebd5a92fbc751bac60a9a76f0ecfb897fb6fc1bc534
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9D 21536 bytes
font_02_sfnt_off000164cf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x164CF 16792 bytes