Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0232196806db12e…

MALICIOUS

PDF

84.2 KB Created: 2021-09-01 22:35:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3d04755ebcd14b94c57fdf730160cc56 SHA-1: 25542ddb0c43558a8c06607109d618e64afc4b30 SHA-256: a0232196806db12e3c4c37f4e710d62d8a297ed5fea1716339bfd64b0047a908
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is classified as malicious by ML models and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites and potentially malicious PDF files, disguised as a motivation letter. The presence of numerous external URIs and link farms on disposable or compromised hosting suggests an attempt to distribute further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pakistanchristiancongress.org/userfiles/file/86038153740.pdf In PDF document text
    • http://candientuvibra.com/images/file/75559235741.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/68105259660.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/73209830419.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/95034801698.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/gabovolorewofirivu.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/metataxotapitixuxupugapas.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0bda2504c---wikik.pdfIn PDF document text
    • https://thehero88vip.com/ckfinder/images_store/files/88362707873.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e9434c41d---loviset.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1608515973c36e---vogogawezeso.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/33569468260.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/55417170152.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b3f807bdb---9389848318.pdfIn PDF document text
    • https://www.roadsafetyrental.com.au/application/third_party/ckfinder/userfiles/files/50950063724.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/65579127418.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7f099692b---69644042729.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/boxexixiraruso.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/fijolokaguvizo.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd698836d0---3640223139.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/n1u7l7od6cvkp3qdp6rq1lafkr/gimexutogewijevebodowo.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b89437a2041---juturoturedibekemojapulef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=motivation+letter+for+research+internshipPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/cd43e2b017cf2d166428cde9987526ec/sisoxafoliruge.pdfIn PDF document text
    • 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_off0000e425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE425 10636 bytes
SHA-256: 61ef9c302728f1d711fa98565713aa98211b2b165d0d7c64b83deb894fd499ef
font_01_sfnt_off0000fc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001148f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148F 17468 bytes
SHA-256: 638b9e2e46a9223734fcad9ac476dac87af0bd33ef3d42e9ddd67d2c6fc5089e

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