Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa447a25ae4a9502…

MALICIOUS

PDF

75.1 KB Created: 2021-07-06 19:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e2327c25259f712d61e76b23ef18f161 SHA-1: 7e3d8274dd65ed59e844dcc613aa02776b7ef370 SHA-256: aa447a25ae4a950250b8d6f1b8896628421ccba1d5c754dd7239dd196839f25c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting other PDFs. Heuristics indicate this is a link farm designed to direct users to malicious content, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/ondhepakn9be7opdh27betjddn/xabasigazukasoje.pdf In PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960e5c4c007---magedezibixajuvonu.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/bopizuvonujutegivexo.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/rizobiribujoguwawupizife.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/6a84eed2e38252e0c4a3442fdff75ef9/vokoramopafaponipune.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160857c2dafaf3---46352073821.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/kalejilegagiwodekivazuten.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/280057585265.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609e66f786836---kejuveminosabupuxetis.pdfIn PDF document text
    • https://aokman-drive.com/d/files/dukuxizelud.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd2f4ebc47---maroxewazekilimoxaluve.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/dr48f0sidb19lfa5lh581dau92/repuxelelovobulabefusufo.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160ae82284dd5c---81496468761.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/38710441418.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/51031656096.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/69640821350.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d6c05426227f8b54548f98588b1bb4c1/88180223311.pdfIn PDF document text
    • http://agama-rc.com/upload/files/toximojolunota.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/dosutubepug.pdfIn PDF document text
    • https://ocw.tw/uploads/files/govuzodateg.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606dd7e9a61c7---bizoguramaxupik.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d54cd78d7---zadudunanapodabokof.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/0ok1fl43p2ng0s6mcb9su0n8tb/fadiw.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/pujekovobid.pdfIn PDF document text
    • http://minerva-collection.net/files/files/dalujazopopuwodoti.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6a90d5847---bevadopa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=steel+structures+design+and+behavior+5th+edition+pdf+free+downloadPDF 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_off0000c00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC00B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81D 16636 bytes
SHA-256: 9070e5b521a3d0e27873255299b94f773484c5689f4380b892d214bd76d44d43
font_02_sfnt_off00010365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10365 11500 bytes
SHA-256: fcc27fbfee8138c4fc85a682a478db45948b1bb4c599c58fda6fbb63f3b4705a