Malicious PDF — malware analysis report

Static analysis result for SHA-256 593192cafd6df3e7…

MALICIOUS

PDF

91.7 KB Created: 2021-07-19 15:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2a223bf73f17e49c4169a65103ade800 SHA-1: ee463071a298e1154cb57dcce8ddc3668fbd2096 SHA-256: 593192cafd6df3e731a230fb393d094e84a4cecfeece1c613c784fe5547c1d6b
156 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous URLs pointing to compromised or disposable hosting domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs are designed to lure users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/vedexewobudizitogawo.pdf In PDF document text
    • http://mazdooradda.com/userfiles/file/gurunajutafupigifuma.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e42199dc1---fibexineruwabezasenomu.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/6b19a910528011064351af0fb7c641fb/2240516762.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210529085121.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/namazuwizavebosixikote.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/kexunedigososa.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/dumifiditawalav.pdfIn PDF document text
    • http://rld-carbon.ru/file/81456928404.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c638890250b---galawuxapujorinax.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/davukedusuvobeginifo.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/65206646505.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1bed05997---xoxak.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/xojadakesipelixuxemal.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16084601d2ace4---37951284918.pdfIn PDF document text
    • http://mega.kz/media/upload/files/fogejudokurerop.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/6769024482.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021052417503473499.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/93365747333.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160741b0d4d1a3---bazutov.pdfIn PDF document text
    • http://zuche0551.com/upload/file/finofirobadu.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a16fe830a---vizopadi.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6885c3c1e---88400474858.pdfIn PDF document text
    • http://ibb-online.ru/f/file/zomasozajevixilezomiri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=fill+in+the+blanks+with+appropriate+modal+auxiliary+verbsPDF 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
font_00_sfnt_off0000e895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE895 16488 bytes
SHA-256: d0e02ea597b059e12c640018e4c0b859d2fbe31b167f59dc9fd0dc6423c65742
font_01_sfnt_off0000ff82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF82 11332 bytes
SHA-256: 55d269e7eca11d6441e701aafc973bed2cd681870a81575b3eb0a6093672526d
font_02_sfnt_off000119d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000131e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E4 17440 bytes
SHA-256: 981acff7ce7a3c81ec54fcc37ee442ea7455d794f869b0f47906dd1869420453

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