Malicious PDF — malware analysis report

Static analysis result for SHA-256 7851611df8e691db…

MALICIOUS

PDF

85.6 KB Created: 2021-09-05 02:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1c18b8ceccae428a96ffe3e14036f87a SHA-1: 98029bbb802b1445c82a98a8b3bf772ff6a93f25 SHA-256: 7851611df8e691dbcb105f0bc3323aed5f868a309f454d7e28d7cfefb54b9169
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, which likely serve as a link farm to obscure the ultimate destination. The presence of these link farms and the overall detection as a phishing trojan suggest an attempt to lure users to malicious content, likely for credential harvesting or further malware delivery.

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://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7027b34295---92432147882.pdf In PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/46081446356.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/giborakugumarowetixa.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/37054638626.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/tezureka.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/78680683273.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/43eb9d6c3da868d874fe73494094ca97/74242701793.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/d329a33bd77c9a3164dcb892babae6d1/94228072814.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/48413988874.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0d883c7fb---zewedit.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/81253932999.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/tidituri.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/veguvulixifiv.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077223319dd2---45988436952.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/18881841397.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/4qr0s5bp6fhj612ksbhccje1ou/18609909335.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106466305a39---24993191642.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/n5ooruc4clqgj49udi0ngssdl5/taxisaziwakigukigejifer.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3cd3a88e7---konevemuwivig.pdfIn PDF document text
    • http://scsytech.com/upload/files/widotamotulegus.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160be8e28a3894---9173179748.pdfIn PDF document text
    • http://fotossc.pl/_files/file/78887151913.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/lizurusuzexitovi.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/61696560301.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=cannabinoides+libro+pdfPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/83689414464.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_off0000e7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E4 10564 bytes
SHA-256: 6897be6cf388223e041c8fc242bc150f720c852383d5321113baffd454825e64
font_01_sfnt_off0000ffda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EC 18840 bytes
SHA-256: bef3898501c12e83d009e362def4e8b6f4afd7f3e7d0313c1695e0aa7a3732ee

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