Malicious PDF — malware analysis report

Static analysis result for SHA-256 931d183125425e18…

MALICIOUS

PDF

81.9 KB Created: 2021-09-19 08:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 378b3ae8fbebc7f556917a0dcb536577 SHA-1: c7c6d0d68651d4f789e6d23e1bd6d0a5cd6be5da SHA-256: 931d183125425e186054ece67fffb53b646a799a6f958a3c8646d049327580bd
176 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the document being a link farm, with many URLs hosted on compromised CMS uploads or disposable domains. The presence of a QR code lure, though also used legitimately, further supports a phishing or social engineering attack pattern. No scripts were extracted, but the overall structure suggests the PDF itself is designed to redirect users to other malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://as-eng.biz/userfiles/file/39178859916.pdf In PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/pokusowaf.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16143ed53d344e---derafotopededizexiza.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/kositopodipogolejenog.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613819d9aaa42---38494755117.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbfb22399f---worixegobajezenam.pdfIn PDF document text
    • https://fong-cai.com/upload/files/xegapamo.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/fubukudukada.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea6b00966a---vanod.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/fokugiwemiwelixafiv.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/68932916880.pdfIn PDF document text
    • http://classtool.info/upload/files/31786610648.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/6967244376.pdfIn PDF document text
    • http://fkhd.cz/data/img/dujojumunemunafiwefokexe.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/66582787737.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/fenowawukiwoxomibifafaxan.pdfIn PDF document text
    • http://bwc.lt/i/zijovemugopexeliw.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/lelexofuwuxoz.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/niwevakuni.pdfIn PDF document text
    • http://millecolori.it/images/file/sonosafuvuruvizixizojam.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/fusavowuvolafuxezewirag.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/japajufiwajizitivazanos.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/25564438576.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/bukapawetovirok.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/98554063544.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/3629895489.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+make+iphone+scan+qr+codePDF 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_off0000d9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E0 18256 bytes
SHA-256: 36b16ed7d6784cbf4aed0af9e3770399d1926baf05c70551727dc3b9ca8e069b
font_02_sfnt_off000120c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C9 11048 bytes
SHA-256: d754021fd4a065997da4226d9828963bdd91927e3e986b5b6f7c978f505ad956

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