Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f47a3bba60d1819…

MALICIOUS

PDF

72.4 KB Created: 2021-09-17 17:16:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1a83165d3a392f54c202718914084c53 SHA-1: 8baebf3e36a06ddcab46014a6f1a09c4208fdd86 SHA-256: 6f47a3bba60d1819ab7e8154758a817fc8b05d0d26e1c612c00fd5e158da1c3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://tuanlongland.com/upload/files/wimupebokonu.pdf In PDF document text
    • http://thietbiytedaibao.com/media/files/xomiv.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72493336881.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/dijod.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/xiresev.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/e5d2ec2839cadee446bee39eb5614cef/verutufudufojesugufum.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/tulofudepereravaresebebib.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/27346360129.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/71688211974.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/tikotofezozabuvarenakaz.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/14521285691.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/93043394222.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/loketasuref.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/89984006881.pdfIn PDF document text
    • https://undergroundtakeout.com/userfiles/file/55433803895.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/butebolutuledetalowabu.pdfIn PDF document text
    • https://hoavily.com/uploads/files/gilemokawodubizotuvik.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/24213652036.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/94eb8256a7a82369b367261640848f8e/zabazulexide.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/gugovejajixuvi.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/4b88f199cf5572db5691671608ce8da3/rigajatofinemisutigitawil.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210911221521.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=ralph+breaks+the+internet+full+movie+in+englishPDF 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_off0000b597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB597 17420 bytes
SHA-256: d93d646094a7cd90059a7d1c09fd8762181af22e01bf9e58814da5fc5bd5bc5d
font_01_sfnt_off0000e1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FF 11248 bytes
SHA-256: 7f62d80dd108342e4760bd9f70327c15f00066e5d9b62d965ed8f442ab1b5227