Malicious PDF — malware analysis report

Static analysis result for SHA-256 204654aa43394068…

MALICIOUS

PDF

83.9 KB Created: 2021-08-24 23:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: efad0ceaaa9f3f57fee2ea7dc5251848 SHA-1: dcaed7074c5d4e9651d5eee93343f97131dd62db SHA-256: 204654aa43394068483c80a6a82a8f1c4e0dc47be0e2d15ebc2c6a932671e779
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to numerous URLs, many of which are hosted on compromised or disposable domains. The ML classifier strongly indicated maliciousness, and heuristics identified it as a link farm designed to distribute further malicious content. The presence of multiple compromised CMS upload links suggests an attempt to leverage legitimate but compromised infrastructure for hosting malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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://a-xian-coat.com/uploads//files/202108120410021493.pdf In PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/2c31fc55ff075429b00e85a229ab13ab/45012857097.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/87925787901.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/hvrj36864318fk8g18u5v7rit0/93047942950.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/4876464610.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e67227b5e3---veroboj.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1apfn9lvncmj9mnkbr0qherpe2/jawibujifofufa.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/xalikiropuwale.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/69376165492.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/a39ccb35b78dad45731cff4f876cd771/78247222769.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b163bdba5e9---41531034323.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/efmf090jhhj0ipmbiihgdscou4/jomarovibudepesaren.pdfIn PDF document text
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/levalalis.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/cfcnegol1lpd199b55ncru76m4/49030030470.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160766697a8381---79756411122.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098aa56b854b---47012398374.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/7fbdc7be89d4daad9e496d20f0aca778/pazadanejuxipamewov.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/ziluzefinatedez.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/69633517469.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/1ll4no98jalmihseqldo52jhvc/mitasuruzukuwidutukifu.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/32447918998.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=second+grade+reading+passages+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56C 10724 bytes
SHA-256: 5374b7d7a95d7f1a584e1501c373cbb3111581596e7104ed7ff87c9e2ffbb8ac
font_01_sfnt_off0000fdec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FE 16804 bytes
SHA-256: b7228590b97997f18e47c50ea78db6f683bc7d1ed31b09236e776e93d7da0686

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