Malicious PDF — malware analysis report

Static analysis result for SHA-256 147d670ceb2b0db1…

MALICIOUS

PDF

69.2 KB Created: 2021-07-13 19:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 488c7ac8dffb35a9531bafadfe760258 SHA-1: cb727003bc84cdc195a74d0bba92b163dec5a33d SHA-256: 147d670ceb2b0db1b6934ba3e674f90eec6f84407c9e8633b6023299ec492e1a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to lure victims. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the analysis relies on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 https://peilimineko.com/userfiles/file/taxef.pdf In PDF document text
    • http://md-servicios.com/userfiles/file/kilewoxo.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606d08f9b643c---sepufikovefowipogigolizi.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5ab0d605c---tunebulifotusezilefavipu.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/70958740004.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/45tohpv4vgbp3c16n4m1915rf1/pejekivabaginaxesud.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d342689d3b---dujosopitafukinuk.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/0f9a1071cd7a646d4630e89a267b0568/zosezowataweril.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/89435946065.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/3dbcd2d9ce35fcdb6215241fbccb27cc/79692964293.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/26808864004.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/14065515538.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/26003132114.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c25a7514ffb---3236105949.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/34e34008cc0659680cf7eecc0a882193/fukaj.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/rozurikafaz.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/72d411c6fb6ef8b1b10d9f26b5749fc3/zenujatibifarotuni.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/kogagilokago.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/beriw.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607174399ad73---jolomopivukoxawubebonakar.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/r8108v4eeavn89milli5kukri6/vixefutowiguj.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ae68b8cd5b1---fetikugenijigajaf.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/33279489139.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/5c3febb8c718c57a8d2b0688d171759e/54943609775.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+find+relative+maxima+and+minimaPDF 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_off0000b3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE5 14100 bytes
SHA-256: b78bfdb91babbb961f5d7c13297815c92d10108485ace0c429ac4a4e3fcfaa16
font_02_sfnt_off0000ef3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3D 10592 bytes
SHA-256: 7586553146a855999570e8990f60c42bffdd3cc4228b075446d69794df6b6d99