Malicious PDF — malware analysis report

Static analysis result for SHA-256 786f74418a781f4e…

MALICIOUS

PDF

87.5 KB Created: 2021-09-10 16:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aee2534a2fe89c620522d887abda95fb SHA-1: 172b76a54905a4713e894ce11d87c83896613229 SHA-256: 786f74418a781f4e8414a5364449f8ffda2dd91180da306972118fa9820baa9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cpghollywood.com/userfiles/files/81483948574.pdf In PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/37969274636.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/83153015435.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/gagukedojarawuwidube.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/zezogo.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/19686396863.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307d7b81b4b---98000734684.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369acc2b9a3---19984411311.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/vafajekiredawetoxugewozo.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/28099504511.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210908012404.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/pekilitevew.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/juzexu.pdfIn PDF document text
    • https://flomogroup.com/upload/files/menelomu.pdfIn PDF document text
    • https://grnca.org/img/files/files/45615414645.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133cecc23fd2---21209146410.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/16838538676.pdfIn PDF document text
    • http://tunhuaduytan.com/upload/userfiles/files/fitakiparevipidovid.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/jatalowobuririw.pdfIn PDF document text
    • https://cosmopolitanhotel.lastrada.bg/uploads/wysiwyg/files/53271496462.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/97369128333.pdfIn PDF document text
    • http://roocenter.ru/upload/file/falisegemedu.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139bf136aa37---76448608568.pdfIn PDF document text
    • http://skyrybupaslaugos.lt/uploads/files/benofujit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=create+vcard+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_off0000efc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC4 10244 bytes
SHA-256: f44acb33ab4d913a4b2c965bd17f66a4234024d03ae950b6113ed19ee1f597ed
font_01_sfnt_off000106f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F03 18520 bytes
SHA-256: edc88e4cbcb82221a0c0da6410349578ab14bc77473f6819770d9adf1d7cdc40

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