Malicious PDF — malware analysis report

Static analysis result for SHA-256 d37587b4c946e700…

MALICIOUS

PDF

89.6 KB Created: 2021-08-02 09:41:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2e0bd0fa04c47d7e1f23c6f4cf766a39 SHA-1: 1ddfe700ff2979e5cece1e54fbc332b30a33715a SHA-256: d37587b4c946e70009507c9dfc3ad43ec261adc86ffd012274f335e136e8eef8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the numerous external links are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f602b24419e---40650693396.pdf In PDF document text
    • http://adveotec.com/img/file/wepomijuxirizujitisan.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/5fdc1333ad99c0ddeecb53bebe287b4e/19673462476.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/wukutuxew.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161050ac834ce9---72510293167.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/lupabotatatuliroreniwi.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b506b132deb---66633975286.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160949e0c0263c---todedanizukepujilevozoru.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210624_065709.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/0ef4cfb319b6811dd998500ab719577c/97692504647.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/widebinunikogezigovomol.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nibegiwapod.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/87d84fc593310f24849c560fb23ab98f/40179388692.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608d29196c037---bufuvufererosirogot.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/74698089905.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b143651df4e---95792861808.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59833727647.pdfIn PDF document text
    • http://panteres.com/files/files/29603629873.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/kinigadugovomuwizuminar.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/q59vj265o9fuv6lmoh5ido7u2t/rutavuziborif.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021072606282466.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/tulojut.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/debenezumanovija.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=hungry+shark+mod+apk+6+2+0PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCE 11176 bytes
SHA-256: 43e1360177c8b13712aa50174fd0ab690d8e529815d67aec6bd40f813d2a1e6a
font_02_sfnt_off00012785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12785 17644 bytes
SHA-256: b804ec0621347de91e60631162b4f35b2e992d6233a01812d67c334c76fe7f52

Open this report in the interactive analyzer, or submit your own file for analysis.