Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb230f2dbe78d1ba…

MALICIOUS

PDF

76.7 KB Created: 2021-09-05 13:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: aac41c174b2ff2df58525d4504e90e83 SHA-1: 41de9898f27b5bb548441d25cf1ebdd58b115578 SHA-256: bb230f2dbe78d1ba52e1ee6d241e56af5dd48b2c2eeace56458c03e3e75c18b8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The file functions as a link farm, containing numerous URLs that point to compromised CMS upload directories. These links likely serve as lures for phishing attacks or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://rassadaspb.com/new/files/file/78426685268.pdf In PDF document text
    • http://unseretochter.ch/images/file/48429344380.pdfIn PDF document text
    • http://sbkf.org/files/files/42788413386.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f75e943422---92932552071.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/5118f056980e8a91826a54fe8a3fb800/96386072495.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16089aa011c5d0---79270139086.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/a4c5254622be6b3eaa485e5901cb8c3c/tabasi.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607254cd59b78---jokuzosudazimanowibegupip.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/movexexufawepuwoxefaxig.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/zilomu.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091f5255e6f5---polaxejunokiwatudun.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/guxokebinuzaxibumusovar.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6a814906dfecdcd5492bd88da0c3e9ae/xifezinexunawawetozeji.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/59705054702.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/4d6e57b3c2086ee14b4e093aaebb787c/dupapaju.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/62302184063.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/78693597139.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/55a5dd63fdb8f88292ea0dd9f317d2d0/mimovegexezuxanunel.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/mipikugerapemiwisogapofef.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/21fd06e46b40b71e73d33ccececc7ce1/gumelakezisisu.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/45192037779.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=diana+f%2B+manualePDF 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_off0000cc6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47C 16620 bytes
SHA-256: e8406f79ecae8fe7d41b950097ef31464e77bebc95a7313c950e9724d8f34899
font_02_sfnt_off00010f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F62 9988 bytes
SHA-256: fea096f36f6112094e8164a48520c39178f560ce9e246f0a70c1fceb6dfbfc7a

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