Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc4307379c48a4b7…

MALICIOUS

PDF

92.0 KB Created: 2021-09-17 11:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7c10ddb5314a19667428358bc3f7d66d SHA-1: 74107d550123cc9da5f7a392e6abcaa3d66a00e8 SHA-256: bc4307379c48a4b739fbed842c86f1931d71c2eecb7643fe4c1e0f25be43263b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many pointing to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://pistant.ru/uplcv?utm_term=find+the+value+of+x+in+a+right+triangle PDF link annotation
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/84734808010.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/xijadujezixifusedowatovi.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/81856405818.pdfIn PDF document text
    • http://dfanchem.com/upload/files/kowedomapafiwowox.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/54648491410.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/59560951301.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/87898756379.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/75369411597.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/nuvomonokazepugelemukeset.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/95880647596.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/deritisiju.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/2p86ekq80g6tke0p4koemp0hev/xaxevifazakogatake.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/rebavov.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/ladukopisomujeloxixu.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/92740520671.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/tavoretufijetovafaxirade.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109011105159765.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/wuninikedejajopewabigu.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/e4vsn87ql2dshg8qippqfnc07e/juxavisatet.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/1dd411f8f54057409e5860055fafb154/72589995488.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/xezajexebi.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/26383620439.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e420bc191---9711943698.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/57150581703.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614064c6b12d1---gotumuzamowotoxapes.pdfIn PDF document text
    • 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_off0001071a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F31 10712 bytes
SHA-256: 44019033b6439c650a8951fbe123c040b8dcae3e5e971224d254aae29dd31dc7
font_02_sfnt_off00013776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13776 16584 bytes
SHA-256: cdbe15274f125ef8f104e069c2733d108819622c189fefb1f21df72ee04238e7

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