Malicious PDF — malware analysis report

Static analysis result for SHA-256 82271523040b7835…

MALICIOUS

PDF

83.3 KB Created: 2021-09-02 19:30:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a2711c48a388a06bad4d4958a506391a SHA-1: ef74d9c6c20f468f6588dc77be048c556859c62d SHA-256: 82271523040b7835e0427865a27cb67086362f357433e9edd66f9deb5eeb646f
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to external PDF files hosted on various websites, many of which are identified as compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the link farm structure is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607600bc92be9---48700107466.pdf In PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a77f0df16c0---38485782725.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/4g6jvc0vbphrck9506r0c6agiv/lexinetofe.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/55630238751.pdfIn PDF document text
    • http://idaskitchen.org/clients/d/d8/d86ca706a5600d452cde81e4a21b2d68/File/kodotazem.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/80321162176.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/6dtelbqauepmb6gtv3i4dppoln/xetuwerutegoxu.pdfIn PDF document text
    • https://telliogluhukuk.com/userfiles/file/kagakupov.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608875dd8f06c---43270300216.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/8918683879.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/xazetebevewapuwisifafov.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/30684434977.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/54721830398.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ad89ac876b7---22074741275.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/48066500477.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/90502075502.pdfIn PDF document text
    • https://advik.net/userfiles/file/67574303839.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/samezepipivulojemezupe.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/95mnftego5at9ldpg9tj7igtac/59618220766.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e44b46c0af9---xojoru.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/67658883125.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b70c6d05204---63501413519.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/perenavudutusal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=ssc+time+table+2019+maharashtra+board+english+medium+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD501 11844 bytes
SHA-256: 72db310859e9468b63dcea78703dcfeb24a4e7eea7b513e64de6b890fe0976cd
font_01_sfnt_off0000f0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C7 20656 bytes
SHA-256: c46461bdb95925aef1aedd4f3e5e3a03330f7a8a3102513d02e8c8c35a86d36b
font_02_sfnt_off00012753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12753 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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