Malicious PDF — malware analysis report

Static analysis result for SHA-256 535504564b28fd8a…

MALICIOUS

PDF

95.9 KB Created: 2021-08-05 23:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a41cd3a52b3ad786c4f295526734726c SHA-1: ac5498b451e3c4d0b51e055cd5572a30146cb0cb SHA-256: 535504564b28fd8a0b3ccbc9971e7b3355211d7768d1e12ad1fb150f014ce884
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and link farm nature suggest it's designed to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d0a3080c4---tazeguduparegezi.pdf In PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/mnleqff5cuk4lajhlccng963s9/nunen.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa0e03e9eb---safezudopoxorififokinis.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/juh5u4kbmbpgckltgbuma4d49q/32978615260.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/29898757555.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/wikowixi.pdfIn PDF document text
    • https://badrivishal.com/media/vepekorerir.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/tafituzeni.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e86d896698---foxoroma.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16103cd468d573---modogekijanowiraton.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d64380e13f2---lasifavaxe.pdfIn PDF document text
    • https://ntwbearing.com/UserFiles/File/wikaxinavita.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/xagit.pdfIn PDF document text
    • http://suankaew.net/upload/userfile/files/83298574089.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/448601504.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d41bacb7e---13079551271.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160acb5e0235ae---jerevis.pdfIn PDF document text
    • http://hainfelderteich.at/29174287262.pdfIn PDF document text
    • https://groupburuemas1.com/contents//files/gamadonid.pdfIn PDF document text
    • http://littlefreddieking.com/clients/65037/File/rugiwubomesivigikojuko.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/38ee43177c263c77152e597ea41ab2ea/53246400323.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/28811589595.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/39826507243.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c570eaf2d73a193b96d25aa4fd94fe6c/puvigopabuzelal.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/dosanipe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=what+is+the+role+of+dimensioning+in+assembly+drawingPDF 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_off0001113b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113B 17396 bytes
SHA-256: eb1f6438fea2f4b735ee0d6108542a48feed43c829fa69cc132620e8f26fdf9a
font_01_sfnt_off00013f0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F0D 11136 bytes
SHA-256: 2b3e8158109fafb1202dcd0ad0d97e586a2abdb2861227dbbba9df2273a89047
font_02_sfnt_off000158b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1