Malicious PDF — malware analysis report

Static analysis result for SHA-256 640ccb043122db3a…

MALICIOUS

PDF

88.0 KB Created: 2021-08-30 01:19:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6d6b5d2dec23de1e350d5ac41816e492 SHA-1: 9226182790e8e4eca7c33bad00b27121e33af07a SHA-256: 640ccb043122db3ad63ad5febc435af4ccb4bf912706b70890b270cf250821cd
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, which is a common tactic for phishing or malware distribution. No scripts were extracted, but the embedded URLs and the nature of the link farm strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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.focus.mu/wp-content/plugins/super-forms/uploads/php/files/aa958c1f7cc4de927388e4793567f662/sobog.pdf In PDF document text
    • https://semineebrasov.ro/printuri-fi/files/10472168078.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b64a2c964ca---jidid.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb88a3b4981---lofatelusak.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/12274828920.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/b181686733a0f51f276cfde06afddff7/30265554225.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/28244252986.pdfIn PDF document text
    • http://worldwidefilipinoalliance.com/uploadedFiles/files/zofotajemam.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/78421452931.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611018d4550b5---17828886260.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a4f24ff4f---sukat.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/nepavi.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/58044337268.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9717bfc3d---3501015492.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/29396089536.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d1fc95c4419---kedovokifalowumigeje.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d22ba7e8af---fipopuz.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/nezokawugimatawazulus.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/tujopajudogape.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/031659269315.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/44b603895d04ecf4804ee7a355c85083/sedepusosebovepugu.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874a65c40ff---mokamipunusejumubiwukax.pdfIn PDF document text
    • https://nanosoft.mn/images/content/File/54386923216.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=classified+meaning+in+englishPDF 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_off0000e70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF21 10516 bytes
SHA-256: 6ad1e8391fbaa357a0f0d8f0d3b0706703bc0c257857e1084484f044aa238ea1
font_02_sfnt_off00011688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11688 22696 bytes
SHA-256: cd4e0b969519e0ff74d4fc4d414332ce5676f7201b449b449763f099fa55a2c2

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