Malicious PDF — malware analysis report

Static analysis result for SHA-256 aed3a146e4d9ed96…

MALICIOUS

PDF

77.9 KB Created: 2021-06-27 19:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 996ebfdbc0b007518e9632327661e1cc SHA-1: 5a4c984111dec43547dd27b6367e44935168ef1b SHA-256: aed3a146e4d9ed96f504070215912be44c679e8e26b5d9ccd7c0eaf5a9b7bc60
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of links, many pointing to compromised WordPress sites. This structure is indicative of a link farm designed to distribute malicious content or facilitate phishing. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/92dcac746a182b4572a0a74b118bca68/92610229278.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/5v5plr12iqjpjmkakckost2c64/wivavorut.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/f3caa9ef46f589dcf5f28fcf9e1126a4/ruvatovipe.pdf
    • http://ambvetfanini.eu/userfiles/files/7680090741.pdf
    • https://soyana.de/js/ckfinder/userfiles/files/gudabifokasokogu.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d25e47cd53---99553815403.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/isf6frhi29fbao03t68brvker8/bogelebuvizido.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b67ea4cf4c5---xudefofikaw.pdf
    • https://study4student.com/cache/fck_files/file/14125205946.pdf
    • http://oilmachineydy.com/d/files/97630184493.pdf
    • http://gymostrov.org/gymostrov/userfiles/file/58367550703.pdf
    • http://www.salpasafarit.fi/tiedostot/files/zerazisij.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/a82c4506d2c7b35713d8ec56860ac052/27296458907.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/cs72dj6h1pl7735id3bl0bikiq/folewopamomaxo.pdf
    • https://bandotrading.com/uploads/file/19774032867.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160771c15014d6---fuwemorukipiku.pdf
    • http://bayernglobal.de/userVZ//file/vawifosawedifugasi.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160769e1f0c570---kolujovu.pdf
    • https://hotnews.md/upload/userfiles/files/mefupitu.pdf
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/6468684714113e93b9e0d7f336eb6fb1/7729926785.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1be2d7f74---nirojiwotowudokovarug.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/571be026732dc2867e38b32cb1c308d1/92022243719.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=instruction+cycle+in+computer+architecture+ppt
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEE 16792 bytes
font_01_sfnt_off0000e400.bin
0778154c66cef02f0a3012561ceda40dcdf4362585fe28da6709850e7d8ca5c8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE400 16916 bytes
font_02_sfnt_off00010f68.bin
5724ee2f25964b1b73f8d02c158e94df9ace02464ccc943d38cc75adfc6ff22a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F68 10804 bytes