Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa5201a17f876dd…

MALICIOUS

PDF

95.1 KB Created: 2021-08-03 00:21:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5d030b5760ca568ae2b48659a25279e5 SHA-1: 0452e2edaadd6f9abb7860a9ead5cf152a99be4f SHA-256: efa5201a17f876dd32ba066ec39a3a970ba4a05faf2765fa7cb970f0f3415fec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to potentially compromised websites, suggesting a link farm designed to redirect users to malicious content or phishing sites. The presence of embedded URLs and the structure of the document strongly suggest it's part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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 http://fluidearthconcrete.com/userfiles/file/22386956153.pdf
    • http://liubeauty.com/luutru/files/62924149483.pdf
    • http://langeline.com/ckeditor/upload/files/83404754923.pdf
    • https://tidaksusah.com/contents//files/27839201034.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/0uro8t8gapt6npjuo7c0oni9mf/sulapofawijenivu.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/9e7e54d48dfe26316aef80ffd91fb4d5/nisej.pdf
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/002e1d7eb452b1494ba457fc01315757/17345577328.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a93824224---24974399075.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094c63bbba00---xedurineza.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d83da103d22---78694390149.pdf
    • http://a-kamen.com/userfiles/file/45356093403.pdf
    • http://rgn2u.com/userfiles/files/gowewefaza.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3d2b471fc---jegidisokabafogutafo.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071a54e06d8a---48440424387.pdf
    • http://antifftech.com/uploadfile/file///2021051000475861.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/18749739283.pdf
    • http://phamtrangia.com/upload/files/norixugofujodasikediwaw.pdf
    • http://global-leasing-management.com/uf/file/nuvuruluxujisavekilupijev.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/359b435475052878ddf00319898b43c1/nirusefinovexo.pdf
    • https://bdaudit.ro/userfiles/file/93546207373.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/2a5fda4032248320e6fbe5cb11b610d4/fisoxekapezorabofewe.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e55329a5fc5---70916819962.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073949ca82b0---6939812726.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=cutera+xeo+coolglide+laser+review
    • https://lapdonline.org/file/17539801534.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5ca.bin
b5cd1165c9e76d7d744b6854a62f0cc25fddaa05f06db61b18e1ce3a75d8d9b6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CA 18336 bytes
font_01_sfnt_off00012635.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12635 16792 bytes
font_02_sfnt_off00013e4c.bin
7af0cc395219e30bf75f1dc4cf6aa2f051bfc1e93487c04c4caa784da31cbbad
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E4C 10828 bytes
font_03_sfnt_off00015750.bin
97e3f73a58ccdd4784c9ae1678d9f90717e6b6d0c87c36bf93adb8865ef65ebd
pdf-font-stream PDF embedded font (sfnt) at offset 0x15750 16192 bytes