Malicious PDF — malware analysis report

Static analysis result for SHA-256 66b5aba9d5850186…

MALICIOUS

PDF

91.4 KB Created: 2021-07-19 07:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 62fff0717419e9e64c7582f43670e887 SHA-1: 5f8d8c69b3dd12032a4c520114ef36bc7e446b61 SHA-256: 66b5aba9d58501861d153235993a352da61d7677518d77109c4388b815b2241c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to obscure the ultimate destination. While no scripts were extracted, the presence of multiple external URIs and the overall structure suggest an attempt to lure users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 https://dacinsara.ro/fckfiles/file/mopamek.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/71309ce2afaca07c56b60d334edb702d/83833617487.pdf
    • http://hum-lucknow.org/test/fckeditor/file/tutoribijirejika.pdf
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/369c65261a0ce9c481ed401e78569c2e/64285723930.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a51f45be2---14047565444.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/e8403c7f1e18b6c9e4f42d5bcf0d375b/bemewip.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef0b373f55---xotokeniwiromazugalizi.pdf
    • http://irths.com/upload_files/files/5889319812.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/0fedcf920e96e4c6180f303608b5723e/fopovogibufa.pdf
    • https://pypconsultores.mx/userfiles/file/lipapibaburenege.pdf
    • https://caribemed.com/userfiles/file/58005288529.pdf
    • https://feng-shuiworld.com/userfiles/file/wivubazadupu.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb70c6166d---56294084361.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/f947aa40025f8da62eaf98c0b5395ca7/43398815373.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/2a9d16d8d390d51b26b5c6a5841c0dd7/judobunafafitulabikat.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160de877b0aa3a---nubebuwezuruxulebatozefub.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/jqea08pq4ot69nrfiqpp2tlhfa/majafafosavesuri.pdf
    • http://augustaelectricalwork.com/editorData/file/64617848460.pdf
    • http://orderkiwicafe.com/uploads/files/29812833846.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f6b56fa9b---nigunu.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/82f597710346174dca893f28578521b1/devarosemuperiwowopejek.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16071c1c50193b---dolefefaselipoma.pdf
    • http://murito.fr/ckfinder/userfiles/files/7842141414.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/e7411faffcc23801931a8dfce73d33ba/pujobuxumitexawidobakus.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b650516a985---85806981399.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=my+wife+is+an+angel+quotes
    • 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_off00010043.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10043 16792 bytes
font_01_sfnt_off0001185a.bin
dc1c3a107b43aba624355299a3aa58165a4b5952621c20ff691b07b4af6e314a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1185A 10728 bytes
font_02_sfnt_off000130f2.bin
8f801b84024215238d29db444aa5c723ad661c0bee3726f605b68030a56131cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x130F2 18012 bytes