Malicious PDF — malware analysis report

Static analysis result for SHA-256 c37d75a34383b213…

MALICIOUS

PDF

72.5 KB Created: 2021-10-02 15:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3c76d22cfb21947e1381bf50e6478dd1 SHA-1: 14971f6eb941f2cc04f02fb46101ffe8584a595a SHA-256: c37d75a34383b213ecd25ab43ec8e6a24162c4cdbabcdfe0974a4c7447e81177
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, many pointing to compromised WordPress upload directories or disposable hosting. These links are likely intended to redirect users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c6f10562e---22107046184.pdf In PDF document text
    • http://amandamaitland.com/images/file/64583216488.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351b1b1347a---96995618874.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021101613181200.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/zelelulizomumoro.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/falewapudovibapo.pdfIn PDF document text
    • http://organizeteknik.com/userfiles/file/50984298606.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161537bc55e027---43758445930.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/nolovibezet.pdfIn PDF document text
    • https://gopherscopes.com/userfiles/file/tegevigadalom.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/33308641184.pdfIn PDF document text
    • http://garderoba.sk/images/_file/23552197413.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/58444470393.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9fbfedae2---jatoperumonofaru.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/tonikotag.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/xitikikuduxusirer.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/5184040322.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/50837257000.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/jotexalujif.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210910124524.pdfIn PDF document text
    • http://beta-rc.com/upload/files/65185559438.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210915171747.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/guputubexufoxadanirevi.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615124f419b10---78665404393.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=so+you+said+you+found+somebody+elsePDF 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_off0000b2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB12 10748 bytes
SHA-256: 15b9340fffcf0b97c1fd4ce73639549d4ba7e30e71764d86c5d0037b672f53d9
font_02_sfnt_off0000e3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B4 19240 bytes
SHA-256: 27345c4dd3d3f850f02f944554842acc4070b6a5e110cac633d6467e30fcc1e7

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