Malicious PDF — malware analysis report

Static analysis result for SHA-256 41d078feba0ab969…

MALICIOUS

PDF

105.3 KB Created: 2021-07-13 08:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 61e7e77caecaa0b137123ba9bbb23746 SHA-1: c4032b5e48559bfcd297a5d6abbdb130353d1e16 SHA-256: 41d078feba0ab969f9fff9812feaa5de5bf70ec141867854b28db38521c7f1ae
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning model indicated a high probability of maliciousness. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9687

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://stevis.cz/files/file/74575472218.pdf In PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607015f671a21---90850165620.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160acbda51b66d---mubagikuxotikupefademuze.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/au09brfeavo8nefd2u6qe0a9v6/nakexewikovuwugifabarotag.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/5eq67mu77rg3bt3jj7oh47nt64/57566725341.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608590107e96b---gazudawunobomorutosa.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/c108791fb0673511332621ca16bc54ee/fanegunobakoduxamub.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/9833250403.pdfIn PDF document text
    • http://upbfassadenbau.com/upload/file/64226358475.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/e84f4eb8906724b58b50f68db9957b19/pajuduwabonovipuwufuw.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd74d50e1e---geralofenazenodidobonoliv.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/b280fb58d2adcc8f6bb8a63cd48d5229/luvawavoxipatebukelev.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/ub16llpjft7hjmb1umqjjbjqi7/10328440054.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609297b3a0d9e---83972456669.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/ed44aac1f6ff988d3ffe17f8ea31c0e3/nogatebajed.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/37292882162.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/mabisipilizilulosepule.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca53511ff9---88700235482.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/87135535543.pdfIn PDF document text
    • http://yesilkoyluleriz.biz/resimler/files/ziler.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/kisumozaralejoxogala.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607740c091085---kibozixetagalenaminupulam.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160ba752502792---83321656546.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756e2b96a1a---16837946929.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=fellow+countrymen+meaningPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00013c61.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13C61 19248 bytes
SHA-256: 82fe60729c654bebfa766ac25756d558178a9dffa59fdaf1884ac682466a9cc2
font_00_sfnt_off000100e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E4 23600 bytes
SHA-256: 773feff436a570e7df899d11f59bd0a6e8d72a89fe35c4210cd4ac8632bcc713
font_02_sfnt_off00015cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000174cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174CF 2096 bytes
SHA-256: d74f3b889c282d5ca7c37846058ac216356e81343262a2e5f70480ca4b9a9d52
font_04_sfnt_off00017e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E58 10680 bytes
SHA-256: 821413bb3ce51d085546b718cfdff5299271d59ca6ef0ea1dd30ca10b1645ce6

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