Malicious PDF — malware analysis report

Static analysis result for SHA-256 a327def57522dab6…

MALICIOUS

PDF

86.7 KB Created: 2021-07-13 18:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3c3a94a39ce00675e113fc2da9f1a42e SHA-1: bc49ab3cb708daa57a47dfbdf0554b826df1316c SHA-256: a327def57522dab6f7ed130f257bcd46f0e0840b34fc90393815456ffbc99f84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristics indicate the PDF acts as a link farm, pointing to numerous distinct hosts, many of which appear to be compromised WordPress uploads. While no scripts were directly extracted, the PDF structure and link farm behavior suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://serdceprirody.ru/userfiles/file/vimesubitebadag.pdf In PDF document text
    • https://betalinktech.com/blmedia/file/gulalodozumokapig.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/24672843242.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/3f6e304beb758d57f3f91a81da60a8a8/89212714874.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606fadf8cc7b9---zelusatemiwuwimebej.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160951691e5d22---59841488019.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e41bd2dac---14452065499.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/mavubareluwumokewipadixe.pdfIn PDF document text
    • http://klpa.net/userData/board/file/2685836509.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/68654777210.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef744f0c4f---zutebit.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883d252c80e---rewafategeb.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/91bade1c96983b371c0def595c8c76a1/61485292012.pdfIn PDF document text
    • http://huntland.hu/upload/file/73645582606.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/gikolisapixalupitawodag.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/f9dd807c8849fa90bb34eb2965257d3a/33950367882.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/8b3147d3c20c18b38402a706e2117bc8/xagazujodano.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/59021260855.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/mataxuwutesedewor.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160dbc81c4fab0---fuzawazirivajomatixore.pdfIn PDF document text
    • http://abnicum.com/files/file/19593403171.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a48113e2acf---fefuvefasedobitafo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=meaning+of+word+evilPDF 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_off0000ef7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7F 10408 bytes
SHA-256: e2602b03f2097a7734dc4f38672234894d75fdfdfd1f744e3aa66393b02e9062
font_01_sfnt_off000106f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F7 17860 bytes
SHA-256: 3238154263a471763b9b02549e7ae547d461cef19e9d9febbf17e24e59c1161d
font_02_sfnt_off000135c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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