Malicious PDF — malware analysis report

Static analysis result for SHA-256 3663c9df6bec3f87…

MALICIOUS

PDF

75.9 KB Created: 2021-07-04 12:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c92886257317dac8bd9240e768707961 SHA-1: fd25cb483161431165d8eef87c49619bf42cf443 SHA-256: 3663c9df6bec3f87f068971357f454a49d6b7ac887fd4ecde86519cef166776e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised websites or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://creptiles.dk/userfiles/file/29071286122.pdf In PDF document text
    • http://kstarsmall.net/userfiles/file///51648611521.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/23284257993.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/54440683765.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/97096525284.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/rarufidipawifunataz.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/30163900903.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/qhq1h78gacrccin6h2gocgs4pt/91217783106.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607f21ca1f612---xoreroleniwosolorewonotit.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/7cf4f0b075e549a808a88e8fcebe2a5a/29206163153.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/54563318927.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160761f9df3978---nabalular.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c23edb67f25---36811052134.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/o38ro74ai8gjkgo5j1j44n7815/daruzemiluz.pdfIn PDF document text
    • https://tappowine.com/file/8032455730.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d753321f3---nezulelenopuvosu.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/b3c9a8fb89119f41d3fe2ed1ef00d99a/tulawodadufog.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/lexijiwemunobenoxafosu.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/12209513275.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/l3e65dfem5lul4mhu7be0is18r/77896979670.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd27075ddb---29097073709.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/pivumuxemofejugonaledul.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/2536bcbb7dd5f56071ec7c728e795e1a/miguzojosaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=the+spontaneous+healing+of+belief+pdfPDF 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_off0000c6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F7 10880 bytes
SHA-256: 5bff73f08b1544f16fdca4603b571ebfbbf0e579ba19186d7d0e90607dccdbbf
font_01_sfnt_off0000df99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF99 16936 bytes
SHA-256: d96beb51115fa345b5a830f44c849bcb9b37518ac183a48cf1e214b4bddb53cf
font_02_sfnt_off00010a76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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