Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9755e308c97a631…

MALICIOUS

PDF

87.3 KB Created: 2021-09-03 13:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 005577ef0969f896d097ba58736025b7 SHA-1: 1aacd11802dff0b4a0737e31b6551342d5d90015 SHA-256: d9755e308c97a631015c89a409e3b864b4a231d10e2d2654b89e6ab19ea4917e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV detection as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users to phishing sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://chcial.ru/uplcv?utm_term=edit+pdf+files+on+mac+with+apple+preview PDF link annotation
    • http://hide-bo.com/img/tmp/file/goxakobitu.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vefetibole.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210811115610.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/f12267d9c874f8d36eebe41e2ba7c498/98537119545.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/masidi.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/803f75ead2805fe7cd6b403a382c492b/44936289796.pdfIn PDF document text
    • http://poultech.net/d/files/68476552466.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/1432770090.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ff67d4129---rusog.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/kumix.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab82119b41---92691544890.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd08228f3a---96751559412.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b24a350330---35822400844.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/78857469030.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1610da7e185ccc---zabamidinewifokibuwuni.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/1392665955.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/43995938485.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/begijexumeboj.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/51133370397.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/jexakefalunitepinosewulig.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cfcd5d84e338cff41f7029a9ab1d531d/ragolegi.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612352f19d38c---48313416743.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/rawiniginumemavoleme.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/52291883661.pdfIn PDF document text
    • https://tangentemag.com/img/file/70254638171.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/98304074372.pdfIn PDF document text
    • 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_off0000eea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BA 11020 bytes
SHA-256: 985ce07968ca8bf24ea545079282ed8bacabe8e26440ce616b3da405e2e2671f
font_02_sfnt_off00012030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12030 18372 bytes
SHA-256: d33cce6e1c427fc8c2d465326a49e0df04737cea385f3923e0464c3e989f7740

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