Malicious PDF — malware analysis report

Static analysis result for SHA-256 85dd3178148dd8af…

MALICIOUS

PDF

86.8 KB Created: 2021-07-16 21:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d7bd16b139ce46db4f679be14af1ebee SHA-1: ad7e871d139d71ce7402ff66f9b424f309f7bfb8 SHA-256: 85dd3178148dd8af2400436c03e067f8edd2b6558e34a906664fb5d2c253c1ab
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 and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised WordPress upload directories, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to exploit users through compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c33fca61c8e---zurosu.pdf In PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/2bb702f384cf8714ffad9e794c713016/wesorutetupevujezi.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/25131473796.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/91131352148.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d0d968021---98751914204.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/6067612605.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/musonavuriwivema.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac095e1c2b5---kutudipubijiruxararezeju.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607081fc7c69f---84363838932.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c61f0081414---74380741684.pdfIn PDF document text
    • https://istihdamhaberleri.com/upload/ckfinder/files/guraw.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/bukanutovibibimisozibig.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/429f8b05ac750266031fbe8ba70c439b/xuwupid.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af1d301e072---75828590159.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/ba3ab1035419f8fb70e908d0a636ffc0/86735504043.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0f37364c7---23761134199.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16078c87ed7096---90490494012.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/wigotilulinaxojuvagitabor.pdfIn PDF document text
    • http://gotween.com/userfiles/file///38358013974.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/97f5967a487898d7970f6e2b0c96dc34/53070728811.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d81770908d---83230032233.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb34d10b63---73020728125.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/b50ce9d3a77be6389cd3fdb51179e103/bobovufanek.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607852fd3ff26---jumejonodibabajonatimis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=difficulty+shifting+gears+manual+transmissionPDF 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_off0000f0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DF 10996 bytes
SHA-256: 3ecc2fc4d0a7f69801aa21d744ebec4f22bbac0477fc4d809b602d997a1d3423
font_01_sfnt_off00010a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4D 16644 bytes
SHA-256: b1cca3e8c5bd5537ff3124e14f56fab491dfe03d06632239fb54631489d5a2d3
font_02_sfnt_off00013570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13570 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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