Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc91c9e7cde98da1…

MALICIOUS

PDF

84.8 KB Created: 2021-09-11 10:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5cf7ff4606b6039c03f5d2c2d11a0af8 SHA-1: fed7f75f3fe8d724e4338ea759c6ba693be040ff SHA-256: dc91c9e7cde98da11469d5ef1de71dd57e4e5c5930dd8bd93f80998d825c87fa
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to potentially compromised or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and the presence of external URI heuristics further support its role as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://autosvilar.com/uploads/ckfinder/files/82698480906.pdf In PDF document text
    • https://0900107678.com/upload/file/25819889728.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/fevesegu.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/gumivosaxafukureb.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/pezulavenutaxoligajenirun.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/17070010394.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/73155602391.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369027e6a8b---senifewixefara.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109050649022554.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/fizadugusalobusipuxox.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/wufevozumewizoxukide.pdfIn PDF document text
    • https://network-italia.com/file/kazam.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/meragudanofenuginejad.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613baa97afb5c---gevefi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c20f5c5dc6---dofuxuvaf.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/34475097773.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/48661805919.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/nevokiseguk.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210905021756.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e92cd7706f1242c2aa48cea6f1f1ff9b/62701343409.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/gigamedafibofufe.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/8944353259.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/33529330865.pdfIn PDF document text
    • https://webrobogo.hu/kepek/ganiwukamidogesa.pdfIn PDF document text
    • http://theponghop.com/upload/files/wuwojukes.pdfIn PDF document text
    • http://poliinc.com/upload/files/texewiwixopivefamibakevix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=chess+book+pdf+for+beginnersPDF 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_off0000e785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE785 10736 bytes
SHA-256: d8056a95f0b63fdb04984674f8169db0c11c415acfb28677a7a541880a6e1a5c
font_01_sfnt_off0000ffa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA9 17892 bytes
SHA-256: 7a0496161924f3cfca6d2b5dfc461710cdf77767ea261cc9e8a7d5f7a3db5daf
font_02_sfnt_off00012d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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