Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a47914e8d056bc5…

MALICIOUS

PDF

95.3 KB Created: 2021-08-24 10:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d2b43900fb1ac6d7300dfb57980053a8 SHA-1: faed4b87e4381c78a78e0dede6d43e7917a8ec14 SHA-256: 3a47914e8d056bc5817fcff4d850b411692f3c89e8cf348c7a02ea61219a7bca
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a secondary payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://snbedu.com/uploadfile/file///2021073106051580.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda2626cffa---nizemuxefumezaxanazo.pdf
    • https://tyko.pl/userfiles/file/tefesetago.pdf
    • http://writtenmail.com/upload_images/file/sotijemejok.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081fa51d27c5---ditebemovesum.pdf
    • http://studiomarcheluzzo.it/userfiles/files/63758089121.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/vgps6ql10i57efca96lhh6ahd8/fadekajoraxikuzowutomamop.pdf
    • http://geoass.eu/userfiles/files/24275219702.pdf
    • http://europavloeren.nl/siteimages/file/15036416669.pdf
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/nemerubetudinufus.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a341cfbed3d---sekirus.pdf
    • http://veterinariacasettamattei.it/userfiles/files/41916509927.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/29211b8a868f34dddade3139b3eae74f/surevelabuxo.pdf
    • https://swift-tw.com/lcc/upload/files/kunudawiv.pdf
    • https://sonarmusic.hu/up_image/file/kokejuvoj.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bde24ea656e---82154783344.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/t2ul458epfu4b0tvmpuei8kq5g/jopazuzikerefevovekati.pdf
    • http://thehigh86.com/clients/13680/File/57478203299.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/0jg2i3o55pjto1hifpee2i5v6m/78906682886.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/e9210b358c12330be645492f1e6a61dc/simaporasafikaxurisurule.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/1ts6fuvl4ne0b8cn0g6uo7ase2/68768926245.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160be3ace46119---47869775628.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/29o3tpgum341al3s0f5orgqged/72751858171.pdf
    • http://swiss-ex.com/41104107336.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160971b217ed2d---81271411844.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=frasier+come+lie+with+me
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011208.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11208 16792 bytes
font_01_sfnt_off00012a1f.bin
75733c52d69d5c4abdd12f3ad5ae4ee9831ada6823ec975c03819b2b24542202
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1F 10452 bytes
font_02_sfnt_off000141e6.bin
b0d89b0118ec65b7a17d63fe99d6df510f694d750c14b0efeee1e001c232c373
pdf-font-stream PDF embedded font (sfnt) at offset 0x141E6 17132 bytes