Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c76d270854f3e5e…

MALICIOUS

PDF

79.4 KB Created: 2021-09-06 01:41:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1aca10c44af200ad2a68cc914d958da8 SHA-1: abf3b4ad57f6700b1683073645199b08933de507 SHA-256: 0c76d270854f3e5e97e667c9da69df8c3534fc72399e12e15f34f445fe64ff0c
156 Risk Score

Malware Insights

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

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. It contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users. The ML classifier also flagged this PDF with high confidence. No scripts were extracted, but the presence of multiple compromised CMS upload links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad8c98bf05---mijot.pdf In PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/guvuxoju.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/1274vrsf22r4nfm8qkc0ns58a2/direpubon.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/9977519522.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vebovaxifaxupowabegewukub.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/bitetiki.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/loxotekizevab.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/47591723530.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/c5826638b0be1242b583f90a79ba586a/dubizuselizeduf.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160763d0ac7a7f---51759436534.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161199a4bf398a---88070463676.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ec51c9ac0---negazojakumuxonetazaloli.pdfIn PDF document text
    • http://chinatriage.com/ckfinder/userfiles/files/pasabexuwoxasefugaluni.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b246113064b---52910586413.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/gavon.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/13922828654.pdfIn PDF document text
    • http://www.neocota.com/fckimages/file/94193853036.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/22516942294.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/21825586790.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/povamubojolobetejebibeku.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160b765de6f610---moxuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=learning+colors+in+spanish+worksheetsPDF 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_off0000cd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD49 19200 bytes
SHA-256: 3ee4b3632d01a94eb626de8bf4a4161ade1e540afd9c8a38954a6c0a11c0d325
font_01_sfnt_off0000ff42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11759 10788 bytes
SHA-256: 10b6ba1c5db449df717795dd193b7bb3818060a04ad19b1657dda7220949b2ee

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