Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9b55a040a9e4d75…

MALICIOUS

PDF

84.2 KB Created: 2021-09-05 12:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3372a7ffcf75b5af90b1594f56e139aa SHA-1: f32da2ead4b858427122e9299a5ebbbc6f4ba24d SHA-256: a9b55a040a9e4d7594fdc315d4795aeaf7ca9f9770a1545de68041ba5675cd20
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress uploads and disposable hosting domains. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aec37bb157b---vasajakitalorazizejomikap.pdf In PDF document text
    • https://kaplaitalia.it/userfiles/files/bokutupupileli.pdfIn PDF document text
    • http://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/wowenibufazalobiporuvinob.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/11364251995.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/kudozijajeroxowe.pdfIn PDF document text
    • http://georgeandmaryjones.com/clients/f/ff/ff66b05efb8f16ea353d8e6908bb1429/File/datifemabekomitufafusiju.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/dikipepokunata.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/55280303004.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608782520db8e---73884670449.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/88998277237.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c144e5d748---49114104934.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/mubotimevubi.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/e1257580a0d4f7d3653486076aaaaac4/dabotodu.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/6db694f5a0976bba96e2f6fc1338ca19/tokokopusinamar.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/babafotikazov.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/pofuku.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5a4414720---19860983858.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8618b2d416---97866242457.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/9010ab92da9d56e1cef81ff43b0706bd/35791567722.pdfIn PDF document text
    • https://enerjimakine.com/tsrm1/img/userfiles/file/wepetoderikobofivowij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=english+grammar+exercises+with+answers+pdf+for+class+7PDF 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_off0000e18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A6 11288 bytes
SHA-256: 6d4e11adfcbd794cda2aa99ac1ffa505f6df5a3e45a8fa6dc2ef906442036e3c
font_02_sfnt_off000113d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D8 17924 bytes
SHA-256: cf58c89fb628aa8b9f0efd2f40db6ab8455cd813b53570c2c0d9d46cc0b0bcae

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