Malicious PDF — malware analysis report

Static analysis result for SHA-256 c102529ca35d8c76…

MALICIOUS

PDF

87.0 KB Created: 2021-07-08 08:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 21ad46b466c7b86537b4527e66c617c3 SHA-1: b6f81f34217055fee096ac8c812f9df3d2c37770 SHA-256: c102529ca35d8c763c2a47b2b3a86376c009e39cb7a5d11e4d512213b74fd670
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3823df3d1a---13988090999.pdf
    • https://abugfreemind.com/userfiles/file/38894775479.pdf
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/1g4cmfffk3eg9i6bh9annbeg7j/73853069923.pdf
    • http://jevades.com/aircraft/fckimages/file/jakufoxugosoloxuxuf.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608fde9d317c9---dozakitazexolofaxavaz.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a4df554950a---80537468193.pdf
    • http://chatfieldfarms101.com/userimages/gopumanititozitutugo.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/s252qik3n743afeo0t2ralp0it/32060453921.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080642daa9f3---wovexasajovavogu.pdf
    • https://alihuata.com/userfiles/file/22391043967.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4b99ba076---65752546287.pdf
    • http://tpdw.pl/userfiles/file/dogoge.pdf
    • http://ttccid.com/userfiles/files/55436885090.pdf
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/sifuwonimibarogodi.pdf
    • http://incomsistema.ru/ckfinder/userfiles/files/16606847642.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbe9db470c3---zojejok.pdf
    • https://bloomlight.pl/_bloom/file/rogelivabeligowolilifi.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/2620696001996a4d4e0240c69a94ac88/negatodoleverewufifufiri.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0214e95b46---43782932654.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4d7f0fd84---74010389.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/23475a61dc5a4bbb436542c0a6da95b9/70578968779.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160746f8440db6---26256097024.pdf
    • http://allaboutdowney.com/userimages/75888423455.pdf
    • http://dpsszczytno.pl/photo/file/64021807429.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=what+is+weakness+interview
    • 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_off0000f22c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF22C 16792 bytes
font_01_sfnt_off00010a3e.bin
fad8a732e9326b5bb7b6535cf9475ef55d7e33b4a6ba7227d1813f6d75be3ffa
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3E 16928 bytes
font_02_sfnt_off00013631.bin
9d0616458092332603edd2f481ec9ed0a4467b2a2f4056d6e363ddad358327cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x13631 10276 bytes