Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ddc43287ec9f5cd…

MALICIOUS

PDF

90.4 KB Created: 2021-07-05 07:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ff44aae8067a2baa0cf29e29c4fbcd6 SHA-1: 7dcee6a106f50debf9ad14fa88b0372c2267aab3 SHA-256: 8ddc43287ec9f5cd2f3b5c9f02cc0f9c4c1233fe39c35ecf7cfd20d0137a1eab
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal a link farm structure pointing to compromised WordPress installations and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7c5ce1216---nuzonerivogelefezaj.pdf
    • https://bazab.ru/ckfinder/userfiles/files/90047698100.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2d78904e1---31943923206.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/e2faf9d8360bfa922866db2837b82134/tidotelazijageg.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef904e1946---tadoxolevedejavel.pdf
    • http://shophouse.info/images/files/19676118921.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fb432d6fd---kivuvigezimesobos.pdf
    • http://thicongdiennuocmiennam.com/uploads/files/58972456383.pdf
    • http://arohitourandtravels.com/userfiles/file/86023574382.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a812c039ed9---dupiwebedudesalusiz.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607836fe438c6---bagusisunureximufen.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/b4311270fab793698a33ad143f02f1b3/nebibositopusudore.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3bf0b19bc---dozafobagubeve.pdf
    • http://yuha.be/_files/file/7930337026.pdf
    • http://atomleasing.ru/media/File/69025651781.pdf
    • https://orrizon.ru/images/file/58993567121.pdf
    • https://panificioilcavaliere.it/userfiles/files/34277501073.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68063aa6ea---65490708475.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/0f47b3fd45e888d648d6bfaa2ca7e483/saditulevoxupiw.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609469ec92ff5---84924829367.pdf
    • http://amuseonline.com/absite/userfiles/file/kamegafukemikozerolu.pdf
    • http://jikaramen.com/uploads/files/90841500507.pdf
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/lopujujubi.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/eg2e1np4rugol1nt95rmdq91r0/7397515066.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+long+does+guinness+last+in+a+bottle
    • 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_off0000fdfe.bin
710e4b1b4fc1e44149a516f1ec81160c8f354c5e1e5ee5cd679a9807afe8ab0f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFE 17700 bytes
font_01_sfnt_off00012bfe.bin
55458f983516fd003ea2ed5cd6c3cc2c6e607f75a3c0104d65dc91201c7c66da
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFE 10640 bytes
font_02_sfnt_off0001444c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1444C 16792 bytes