Malicious PDF — malware analysis report

Static analysis result for SHA-256 5657ca113db9746e…

MALICIOUS

PDF

82.5 KB Created: 2021-09-17 00:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 164cd65426e6f754a45ac3c5236be48d SHA-1: 7069bdfa14b6331a1b94423658bc4807e3cedb86 SHA-256: 5657ca113db9746ebd418cee9a98776748611ecca2d496c25e67ff2036f78b22
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://marketypik.pl/zdjecia/fck/file/73431920749.pdf In PDF document text
    • http://hcm-invoice.vn/hinhanh_fckeditor/file/45575387585.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/69838082628.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/fajolugelu.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/tiwejoxozuxorerax.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613983ce61433---gikitepadijolidume.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65154925959.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/66371588145.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/sasekixevu.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c448e0fac7---purelobowomurenobif.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • http://j1ent.com/userfiles/file/20210911002754.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/13326065832.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/8564954123.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/sazajipaveniv.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/36813097524.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/30082152531.pdfIn PDF document text
    • http://honghuibio.com/d/files/78020139885.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/xumiwedofizoro.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/d6492797b6214b8fb3980c158d090425/27153614158.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/sujemetijivim.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/76588348858.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/79808837566.pdfIn PDF document text
    • http://trovas.com/userimages/zedavunagomoxunim.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16143b3da36bff---nakudanefejusuleki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=good+io+games+to+playPDF 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_off0000dc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A6 17956 bytes
SHA-256: c643bc2118dd255775cc57534252e56cde092715742ebabb29b91038e873ef61
font_02_sfnt_off000123bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BD 10684 bytes
SHA-256: 49a510e99e858a5810eb5c9fbc64aae1f17a895b5d8281fe4da16dbcd20589a7

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