Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f1ad1614f15087c…

MALICIOUS

PDF

83.3 KB Created: 2021-09-21 00:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5733b4c214f9bf2f809860a301f2241a SHA-1: d19ea733ca469d4e69aec5d1f2d5a7a246d5b1b5 SHA-256: 6f1ad1614f15087c045517518e7186d3ba9e4664ad00e221aeaee050f4ad52dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a link farm, with multiple URLs pointing to potentially compromised websites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external malicious content.

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 http://bigdoughpizza.com/uploads/files/55768851563.pdf In PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/gosefafukogazu.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/xaxudafovewil.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/36766251709.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/pebaz.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/81221302097.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/97500824873.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/72392308238.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613842b403b7b---gedubogujogedojisobasos.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/danigelitalisapomal.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/jefaz.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/36929533619.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406acfc3be2---99229221097.pdfIn PDF document text
    • http://swhos.com/upload/files/xemupivosolefux.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/rukugefe.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/katogovotodeniw.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d75deb5fc8---navujonobovo.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16132b77b2daa4---62764191062.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/vasunomugadomatuxonaniwof.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/xofimikugaduguz.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/73271873526.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/95448897504.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/37589493057.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-12/20210912124334594042.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fa514f5f6---xofimi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=dr+betotte+metronome+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_off0000e1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CE 17816 bytes
SHA-256: eaaa7da04f639378797662751a7ab22dc9cc06e488d120d1c6231e97302af0e0
font_02_sfnt_off0001283a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283A 10336 bytes
SHA-256: c27402c145ed6642965d0b1acd077987cccfeecaefe0b89a06b7f6f7c1605180

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