Malicious PDF — malware analysis report

Static analysis result for SHA-256 4173c3713f8fab01…

MALICIOUS

PDF

86.2 KB Created: 2021-07-07 20:55:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 070b8b2dd71d139f6b33ca5ad465da28 SHA-1: e18f23ea809e7871711f10ed237eeedaff944067 SHA-256: 4173c3713f8fab0154b6e11148728a9b05f12e1e2e452e47ac02d98d24bbeef5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing formcraft or super-forms plugins for file uploads. These URLs likely serve as a link farm designed to redirect users to malicious or phishing content, a common tactic for initial access via spearphishing attachments. No scripts were extracted, but the structure and URL patterns strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://crewmak.ru/uplcv?utm_term=the+minister%27s+cat PDF link annotation
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ddbb2812d---topuni.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608448ffdc125---71750079289.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083a2e9be4bb---13450460021.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b3057c3d7---vibasideleriped.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/b292890e797c2a3ae549d727fd61cd38/jazinogosoraxolevipitari.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f226e63430---57088336987.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16070d024a74b7---nexegebuxunimevof.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/16996468991.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086cb840870b---wonidesewawakenav.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/76502548568.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/rnk5bdco6ho8slq8f9hrrm3no1/balopito.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/9257f1c95203e46b313be6fc6ca99ca5/desotonaxenivikolawodusa.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/72704181238.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/4q46ttnmhplm8qc6v0feer92pl/devotedemexidif.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/ac7fd0c62df5e2d1c6cd42dc0973d635/51720513342.pdfIn PDF document text
    • http://cnzgks.com/userfiles/file///doziza.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d45bcb3f33---42883262055.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090e39c3de96---mabezorofim.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/53171649681.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/xekaguwazakiw.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/golinefopelapaxorageruxo.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/zipumabodujud.pdfIn PDF document text
    • http://icwest78.com/clients/67591/File/48562569356.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_off0000ef49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF49 10328 bytes
SHA-256: 67492b32800d1d01047f7e047c47dfa1318422b1377b38596b9f32446fd9bd0c
font_01_sfnt_off00010669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10669 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7B 17128 bytes
SHA-256: 6781d7ab774acba5682c20df735e5ad5808e20013b232c9100129fae8afa9bbc

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