Malicious PDF — malware analysis report

Static analysis result for SHA-256 f467fbc22761aa44…

MALICIOUS

PDF

88.0 KB Created: 2021-09-12 07:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 807020a93386212044a9136acc2d895b SHA-1: c6b9343d0868c01f0fda9cb08a674ff7f47ae974 SHA-256: f467fbc22761aa44aacbdbb07480f579e7e7474d1e03fcef583806119ca6d16e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript (T1059.007) further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://philabc.ru/uplcv?utm_term=interesting+mathematical+shapes PDF link annotation
    • http://hanart21.com/files/userfiles/file/tajekubobow.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/5a38f93444fb79f9cfd43e49f290ab91/7707217970.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/goruxawosulodisab.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/diwuwakovivefexa.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/70733882714.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/51026951574.pdfIn PDF document text
    • http://ipublicity.cz/data/file/bavogipufimu.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/saxujujajewuvifozog.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46393941764.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/dejesojewoweg.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/kovamadufibedu.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/97955769055.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/kevomaxetipef.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/89523cac0d7e0bae9d00c9d405ebb765/69184652279.pdfIn PDF document text
    • http://edilcfcostruzioni.com/userfiles/files/tukolopikifawo.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/s8pk1u7ufp2iecqujcajahuvg2/kuzuzetofimumawavifap.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d74a1b2920---18130620079.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/631d63292b703474934bbe1723e4d2b1/jemakakeji.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/64667466925.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/55846088756.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0317492001630826584.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369ca91436f---lolavasuvifadujexux.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rivujov.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/41155618312.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/26642878626.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_off0000f55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6F 17200 bytes
SHA-256: 289d729e4e77ff3e1f001c5b4e41ff2bc19e604f387b0ec541b7fcf67cf01cbf
font_02_sfnt_off000139ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139FF 10652 bytes
SHA-256: 2fb03832675330b0c356611963aa700dda71f43e20b37b12cc9202211ec55c6f