Malicious PDF — malware analysis report

Static analysis result for SHA-256 060cd2a7f9cf9b4b…

MALICIOUS

PDF

110.7 KB Created: 2021-09-02 00:56:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e112d03e3e4398f00ff879396108af03 SHA-1: 8d613b303f274c3e578b85c55e9eed42185ef09f SHA-256: 060cd2a7f9cf9b4b2f959b4f736d44e35b4395b091deb849f3905dd70d43c7c1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Multiple heuristics identified the document as a link farm, with several links pointing to compromised WordPress upload storage. The presence of algorithmically generated URLs and a link farm structure suggests an attempt to distribute malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1eaa70a58d---dirulekapigitew.pdf In PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/17d5fo1g7fcficiclt5a0ifgmm/vukogufago.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/67804820754.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/ad322e0d4rt4ce9khag25q0s3s/dadepeza.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/58080226378.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad617a7cc9---fadax.pdfIn PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/89948139011.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/97773445274.pdfIn PDF document text
    • http://micruts.org/userfiles/file/63225269247.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/019a9317eb7876efe536e8bda0a4d3de/16230583793.pdfIn PDF document text
    • https://bibliothequeanglaise.org/upload/files/41867911156.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/59917370734.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088dc0a739c1---mukerutimopoxutubigi.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/b1fc85faf984fb8f7741e8f1d60eb6bc/mipeniz.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/klqvl9ilnfblq4pp44hlcs851b/45363079775.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/21317630250.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/wopemiwobonizijalekete.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/64249160567.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14615e776c---dilevekarowujuxamipagezoj.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/26811498246.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/ebb74d58493b9b26291b3768f829fabf/95845792227.pdfIn PDF document text
    • https://angkalaris.com/contents//files/86113017280.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/b6d6b18969db937221e5636af0b77674/2749057461.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a5015d931fc---marowujujon.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/7afl749ia4khsnjlrh8kavqht5/24336455719.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=communication+worksheets+for+adults+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000147dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147DD 11192 bytes
SHA-256: 11c0d3f8d575b7f5030c99d04c2a00d8bf9ea8dff0f581dba910e664d8158ba6
font_01_sfnt_off000161ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161EE 19264 bytes
SHA-256: 5b9749ac5fe93b6cbf01c73bc141a2f194c481b381c32d441faa055bb10fa931
font_02_sfnt_off00019424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19424 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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