Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d7facd1158c21d1…

MALICIOUS

PDF

78.5 KB Created: 2021-09-01 03:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: eecb6cff60a86f9ece7c36fb0fd29075 SHA-1: ad438b9067152d7fcbd72ce3e537b70229e947b5 SHA-256: 6d7facd1158c21d1a063f35e7c09bdbebe6ce1b18ef6493c16b28fe236dd8667
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised websites, specifically WordPress upload directories, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and link farms on disposable hosting indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/f9803782a302db5b8ace760d33b23806/wojivebiwus.pdf In PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/90606831356.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/difis.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/talasewitin.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/nitekakaleziduxibanog.pdfIn PDF document text
    • https://sitarasign.ir/data/file/sofisajivimeb.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/okm9s3lp5eo1sj9skru6l8rr0b/63968123832.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a60b201b6c9---66094542613.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b150070190b---popajimu.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/75062969147.pdfIn PDF document text
    • https://network-italia.com/file/jizebidutebad.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/diwutirirux.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/45389561470.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210825035956127.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb3ca6888a---66703092291.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/91784666850.pdfIn PDF document text
    • https://rinducm1.com/contents//files/sudukepagupam.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/13783180798.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608feafd777c6---wosuniziwesanazu.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/21532967943.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/dupagela.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/5lf0g3qhabd6qq93il58l4qchu/59502814190.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/vumibus.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/13r2rum0cofgufebn6ju8np8qe/98861948746.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=to+drag+outPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC19C 20600 bytes
SHA-256: 8150a7860fd2d0c504e77c793ee0f44450fb02ae485f76e90424a7788059eaca
font_01_sfnt_off0000f5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A6 9944 bytes
SHA-256: 5a7cdfc3ebf9deade81e9abaaaaf6505035fe127008c40da5f0d016942a9d06c
font_02_sfnt_off00010b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7B 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_03_sfnt_off00011405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11405 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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