Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e6db6e4a36dc1ed…

MALICIOUS

PDF

85.0 KB Created: 2021-10-11 07:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c59a718d79230187120307a575611524 SHA-1: e793174b5b06a5043943c0c35f02cb8b39b239e8 SHA-256: 4e6db6e4a36dc1ed3c007470d90d9f9f7885adc3cac06e2641798d2a0c0c6b27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the PDF's primary function is to act as a lure to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=to+whine+up PDF link annotation
    • https://taipeitccia.org/CKEdit/upload/files/tolozanifoxorovurosata.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/zaniluzepagu.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/22137206309.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153b3721da52---93914182500.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/22115952439.pdfIn PDF document text
    • http://freeorden.com/media/file/48338651006.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/98288275925.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1614b6c9d60e8d---70603688559.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/kiworadigudusunerirazam.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/dugitisigeguk.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/suzufibuxa.pdfIn PDF document text
    • https://spyboarcams.com/files/xotevawaj.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375bdba24e9---wimorebabugoxos.pdfIn PDF document text
    • https://cncunse.com/d/files/waruxin.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631159521.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/68072472676.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/rateboxadavoritukisakur.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/22721926160.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210912011333.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/fevusiv.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/tifiwamuboxikaneboro.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/161638acb57fb0---15652352015.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/26922226343.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/risalotabobezet.pdfIn PDF document text
    • http://poliinc.com/upload/files/31300861952.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_off0000e35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35C 20440 bytes
SHA-256: 2c1f58138c308b656c119b4149e8de199afcd26b0428b8c16e03b23b7fe03680
font_01_sfnt_off0001185e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185E 9924 bytes
SHA-256: 624469457d9ab5bafd2b821244b6f8dc3f0edd07b2f04e8816a48c31a6733e3c
font_02_sfnt_off00012e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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