Malicious PDF — malware analysis report

Static analysis result for SHA-256 b38fa26b4cdef720…

MALICIOUS

PDF

87.2 KB Created: 2021-09-01 12:37:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 5f3f2fd5885a2ba1087a293e59f0c318 SHA-1: 16e2b5db5b43fe15a4eb7dd24d2ef6b1afc98971 SHA-256: b38fa26b4cdef7207e2df0a8699715cab3c55fccd264c3cedabaac85ba535e15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories and disposable hosting, likely to redirect users to malicious content. The embedded URLs and the nature of the heuristics strongly suggest an attempt to lure users into clicking through to external sites, consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad34143b733---57638327439.pdf In PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6d2387d95---73720291422.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7ffedcabe---71713729083.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/14325441290.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202108111201504131.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/vosukubujurarusizudori.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/46459357853.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/jifijo.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/c0020ba4ba6fd837dc719acd7ffeae7a/19248966244.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16085e7f909125---67156484095.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/24614201995.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/metuxoxa.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607781c904db0---14694177231.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/97406b938881f6e6bd0647cef5f5d0a0/51840860263.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fac5e7dbdd---sesalugugapagiporevojewi.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/48014694735.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/67107506781.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/78532744796.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5860919697---93478336808.pdfIn PDF document text
    • http://tochalco.com/uploads/files/zobizipoxozedafu.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/29rrp3gs4judem5nn9bgocepr8/28709845931.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents//files/41771576564.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/81209676662.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=research+and+its+types+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_off0000ec9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AD 18164 bytes
SHA-256: 939de80418b471c82312fb45da9cbf3cf4e26c1074020ea5567e0b09ce31b43a
font_02_sfnt_off00013403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13403 10712 bytes
SHA-256: 427f6e7e75de9f75cae8560b52b51422ba6a208b83d4791a75956b9f1fa4decb

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