Malicious PDF — malware analysis report

Static analysis result for SHA-256 8997c92ded1eb18c…

MALICIOUS

PDF

68.6 KB Created: 2021-09-26 04:36:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3bb07921e41db2754723afe2cf0f1363 SHA-1: 99395d8bfb6a336edd83070c0574a47b602764e9 SHA-256: 8997c92ded1eb18cb692b7afae71f5c272235fba6e458210a3406908ef9b92d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to PDF files hosted on various domains, some of which appear to be compromised WordPress sites or disposable hosting. The embedded document body is unreadable binary data, suggesting it's not intended for direct user interaction but rather to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://bunny888.com/ckfinder/userfiles/files/57307596076.pdf In PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/f3f15f994ebc270e9d3e14b3fd002308/taram.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/nisuden.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/lejunanewevuti.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/28067227469.pdfIn PDF document text
    • http://ping-property.com/user_img/files/zoxedoxamazosikaxi.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/rototanokitabesuper.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-09-16/9ee2c38e91b6d9bd7410dca9885af72d.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/7010fa84096c8ab8c4f7f5a3c809f307/37859249804.pdfIn PDF document text
    • https://sapsda.org/SapmaUserfiles/file/70576879539.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/vefosagobijenixiwileraw.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-21-03-52-34-32.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/32934840884.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/39833059158.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b5dff12761c78127dccd16b8049447e6/razexulupiradavasijulerek.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/21163722323.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/17553840912.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/ef1f29b6b7ffa9702c18bafe84c463a2/sagilafokegilovunevifab.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/gobofoveziw.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/fitotofineponirusidufub.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/vomebefutunetumuwijasegi.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134083a26d43---sumodosifitawipor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=free+rangefinder+app+for+androidPDF 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_off0000adb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADB6 10336 bytes
SHA-256: 7dfd891d8bf8014cd1b48b27e8902dccad9a64577701e1ab9e1e8a783641a64e
font_01_sfnt_off0000c4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D2 15920 bytes
SHA-256: 5d2807b3aba812494c9e32b3aaae912b734605230cd3c9bc341f64e5a0961a58
font_02_sfnt_off0000ed17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.