Malicious PDF — malware analysis report

Static analysis result for SHA-256 74cf50fff89cf717…

MALICIOUS

PDF

83.7 KB Created: 2021-09-11 04:28:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0c713f3b24c6abb550eea35a2d27ec86 SHA-1: 9a8bef92db8ba07d4dbdbcbee88dd8af028215a9 SHA-256: 74cf50fff89cf71749827c60710bef2021a6eb696e5ecc13f15259f9506d55c6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a QR code lure further indicates an attempt to trick users into visiting external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://laborke.ru/uplcv?utm_term=ttspy+hack+app PDF link annotation
    • https://photopoligrafic.ru/ckfinder/userfiles/files/toserovutupupenuvox.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/19560085087.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/gozojowezafusamonezabuga.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613046c7e3532---45547147712.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/vejuwigepofejigopefig.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/67646651924.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/67533567993.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/23409224873.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/bazuxuranupepuxag.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/29319564497.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/bubopuvagetibej.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/kexat.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/68150570964.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/66mpt4708essiqro7gkk79grbv/54231464884.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/51388112088.pdfIn PDF document text
    • http://it-hair.com/userfiles/6680811346.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/28272471329.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/90342311645.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16137c8ad8864b---66893516896.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/31046229846.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/96002674873.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/zibugaredidav.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/14759461260.pdfIn PDF document text
    • http://kme-kme.cz/files/file/wanijerawebufe.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_off0000e406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE406 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1D 10044 bytes
SHA-256: 0802d07ffe03b1a388818d3a259d9914b5d3b6554091f8847037787833bdecf0
font_02_sfnt_off000112ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AC 18188 bytes
SHA-256: 481936ec76212c438c5704b5623318e41bbc323037975ecb1aba719a4f23b460