Malicious PDF — malware analysis report

Static analysis result for SHA-256 cab71a0550d4014c…

MALICIOUS

PDF

79.4 KB Created: 2021-07-25 05:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b706bbcd46244ddb009c3704d6a1b087 SHA-1: 7d2c22b93884a23cbfa1db195851aa70a70b5134 SHA-256: cab71a0550d4014ccd948b12cb1eb57b3e6dc36a9a5aca295d6a98a1b819b3c7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous distinct hosts, many of which are compromised WordPress sites. The ML classifier strongly indicates maliciousness. The embedded URLs and link farm structure suggest an attempt to lure users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/4c7478b69340e36f01f5ca67f452efac/93214003120.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/6faea8951ec3cb29836eba7caf67aae6/silukixukosuruzotetu.pdf
    • https://scalper.ir/data/files/file/49650290664.pdf
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/julexumefefetiwupax.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/c479a2fac7d028639d466d0256119235/tofejupewirezusexitiwu.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc7736b6ab---7641553590.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9558c876d---74979269514.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ec4055d79---81740454523.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/4dtdpjpp0peb9rt0rb1iu2qt13/82028447260.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072aafe4ebdc---4836835448.pdf
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/653cdd686ff2142decb959cf7768d8bf/83987133506.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/qagga57kb1s7anj5badecpf7j7/fitomuxisosenenubatero.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7527c2da07---sivizozolevaruzuj.pdf
    • http://rurisnet.org/images/file/wefofoxare.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082601e66519---78211129696.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/d18619c4cef6d2a58b3041d00fd4a5b8/notelovigezugaxekas.pdf
    • http://zge-led.com/luodan/images/userfiles/file/80277070599.pdf
    • http://aloeverajuice.cz/files/file/99809801431.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/cdde9d54ee04c471e8c665379b4f2779/18449009655.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/7da7bea40dbf2d9ef197c1fb760c2c60/fokofafojiwajan.pdf
    • https://bikeid.net/ckfinder/userfiles/files/nozawogokelomotas.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/b1a05a65d55b33db0f728c1cccf49559/57926564670.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=9.s%C4%B1n%C4%B1f+fizik+soru+bankas%C4%B1+pdf+2019+indir
    • 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_off0000cd6c.bin
20dc68392d47a19b88a0a694d7b45659903e2cbfc104ba821d5ce5a1ad410ee9
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6C 11084 bytes
font_01_sfnt_off0000e72c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE72C 16792 bytes
font_02_sfnt_off0000ff3e.bin
09fddcf40c09a60fbac24f39eeb1ea257b0f7691f9e9d3b443c41f6b48936082
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3E 18724 bytes