Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfca3286b7184e6a…

MALICIOUS

PDF

151.9 KB Created: 2021-07-06 18:42:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e7d58ef3093dee7f25d0b6de35a917e SHA-1: a5a7c223251420ee8d74f9dc0d7de0e3224d3a20 SHA-256: dfca3286b7184e6ad564c65b50f13cbd31cd8a32b2d4ea2ab91e7b7f2fe05a4b
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of an advance-fee scam. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it's part of a link farm designed to distribute malicious content. The primary attack pattern involves luring victims with promises of prizes or funds, requiring them to interact with malicious links to claim them.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9838

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/51aa787f43b3cc48a1431885c6613ff3/xosoz.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0be0e1277---28170013010.pdf
    • http://aimic.com/userfiles/file/rafipodakenobu.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/832ple4032d4r4vf919eum2gv4/92135131878.pdf
    • http://merrygoldholidays.com/ckfinder/userfiles/files/80411623696.pdf
    • http://unseretochter.ch/images/file/lutafomudutujeven.pdf
    • http://wajl.net/img/file/2021627201914.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a549efce136---difavape.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4cbg5mugkqeinb6ia1ihh3ein0/43925359536.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ca650ba1042c33c5fa3a8613385ba23d/gogedemi.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a55ab94e802---69400319442.pdf
    • http://lapenya.cat/imgjovesnaves/file/1271501349.pdf
    • https://bselink.com/userfiles/file/88949115394.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/3acbba89459836d9ac608a66741e0db1/nimeruxokod.pdf
    • http://stillwaterponies83.com/clients/74660/File/sejup.pdf
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/30844649718.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48516636cc---kuzosi.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607143e5e28c3---32859555956.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/790b07db200b165f7c6058e671ceb520/bitumoxazexujubuxiz.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a4945c1aef7d281c4414be7aec492f54/nonerinesinufowilisi.pdf
    • http://www.awakohchang.com/image/upload/File/7309400412.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/1cd73fe836703de6fc9f64eba3acfe73/kopanitagigufunibedeno.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+many+sons+did+jacob+in+the+bible+have
    • 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_off0001c25c.bin
0fd580e7f36a961fd7e3e0f64633d13cb98904c865020506e3fb395203839d6a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C25C 22252 bytes
font_01_sfnt_off0001fb20.bin
a48d845ce4e36834dac2a84279be3923fce1480194ca31d712ec77128596147a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1FB20 11064 bytes
font_02_sfnt_off000214b4.bin
b8d0253f38dbd31666a396e3248b31bc61e6b303ea9a31ecaa11198b42b700d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x214B4 20448 bytes
font_03_sfnt_off0002392b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x2392B 16792 bytes