Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1cc6924923d8f89…

MALICIOUS

PDF

91.3 KB Created: 2021-07-03 02:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 635af22b9b88b06f4e4df1301e1c4e3b SHA-1: b5171984eb2cc68d027e5143f91bdb8640edd53c SHA-256: b1cc6924923d8f89d2c49afb3b6be1b9bd4d7e5c4aa49c1615451fcc1446da10
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories, suggesting an attempt to distribute further malicious content or phish users. The presence of multiple distinct hosts and the use of UTM parameters in some URLs indicate a coordinated effort to obscure the true destination and potentially improve search engine ranking for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e7ab67bd5---16142628111.pdf In PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/c264020c702885f71949247fb837ddee/bowiladexosokosegi.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/1rvnnqg2k7fhm1hpj23k0ja6rg/munekixulamijapavawonufig.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/78207629261.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3a26139c11d970e226230a29b6000960/39246168758.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/nelugulura.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/44699415326.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/160777220154de---6829230671.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073aaa1301cf---80723645697.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/towesujulubanijunifi.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/dvaoeqj127tmha7gbj0p6oilv4/30076039991.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/luvomupokuwojizomuril.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/45045148117.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/khcf4me77q1puu3fo7lbpdsagb/furomamemarozegeteketo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f7ae6a398---16451410160.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/xozupokiveni.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/071c15f6aae490b78a4ca7d342b35077/64209389033.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/99521959579.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/goleleratufopoj.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa7f82f297---vasozadeg.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/deef6a8d2d605a6b2f10eaca4f9a1ed0/56509968929.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bebf85b7885---lepox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=life+in+the+past+and+present+in+algeriaPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011fb2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11FB2 22484 bytes
SHA-256: cbd9cb23efe21b2283372596b6cd877bdea284972ef3965a5b1366f34301b84d
font_00_sfnt_off0000df99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF99 15752 bytes
SHA-256: 8d32c971018123090d5676aee9ab2a5b1bf98090c6d3c9f675d0a89632115b2a
font_01_sfnt_off000107c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C8 10616 bytes
SHA-256: f4f78ffe8bc8b40a47dedf4648ce4593eac0d7e858183436f538531a2695d865
font_03_sfnt_off00014766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14766 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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