Malicious PDF — malware analysis report

Static analysis result for SHA-256 56a94bb96e341810…

MALICIOUS

PDF

82.8 KB Created: 2021-09-21 09:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 37c0299a758476dc79a0980772b407fc SHA-1: a969d63c3c8c4f452383e5604a89dd35b5b7d1f8 SHA-256: 56a94bb96e341810f71c573b8ad8fd30354aedd4c39ddf047878a9bdd6e49790
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple compromised websites, designed to trick users into downloading a malicious file. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/b1293a7d691d6b46d12c047aa0443b5c/majusotikir.pdf In PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/2283597795.pdfIn PDF document text
    • http://thaide.org/userfiles/file/muzug.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f45b40c515---femugo.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/ravepivifafuwatogotar.pdfIn PDF document text
    • http://servauto.fr/img/user/file/kimifex.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/vogamapufofetudilodezanez.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/35169724845.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/kavasuvusiresarukevelu.pdfIn PDF document text
    • http://quetthe.com/upload/files/buvujafogimogubuvatik.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/noraxabafevugesix.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/lutaduse.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/mejutasir.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/33774434735.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/24864001225.pdfIn PDF document text
    • http://grotech.in/userfiles/file/88199543214.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/jamakebukefamibewaba.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/93545619804.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340f57be5fa---zajebapoxomejibobi.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/xalavibovuwexirul.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/3547337ca8d3c2879a063c5d92208ee5/gujaretalejifupajepajebav.pdfIn PDF document text
    • http://huemin.com/fckeditor/userfiles/file/15075391440.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=drastic+ds+emulator+apk+free+download+no+licensePDF 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_off0000ddb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB3 11060 bytes
SHA-256: 402c4ee80db94d521dd3e72d32d88830447e63b9c40cae1bae16c7c8addc8f0b
font_01_sfnt_off0000f78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9D 17572 bytes
SHA-256: 30833a45a17c1a6e1d2b9271b1da59d45f92e76633d1b7cef34d61e3f7474616

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