Malicious PDF — malware analysis report

Static analysis result for SHA-256 271b7c9edea74721…

MALICIOUS

PDF

82.7 KB Created: 2021-08-07 04:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8c056c771681a4241a105e2e4b7b2e49 SHA-1: 918237abe0dd80d818ecfd0085f9cdfafae6da16 SHA-256: 271b7c9edea7472141f5a849bd05cee4fa74e795d11b03c154257a2fb80ca1ef
156 Risk Score

Malware Insights

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

The PDF document contains a large number of links pointing to various websites, many of which are hosted on compromised WordPress installations or disposable domains. This behavior is characteristic of a link farm designed to distribute phishing content or malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://medvor.ru/uplcv?utm_term=how+to+test+for+radio+frequency PDF link annotation
    • http://dzbnf.com/upload/file///50140034122.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/08kg6ogkqlcap00kfivfkf65c7/fatilavonukuxor.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/eea8909fec18a0908f99e4bb9bf98129/91574805034.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/59650127068.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021072414020341.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b282dbc1004---koxixerolanam.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/86207933606.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/95545903821.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/6847789331.pdfIn PDF document text
    • http://ewtch.com/upload/files/82884572856.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/xelavadog.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/47b8176bdea3c1fe5e80af3e220d4291/92818108618.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2705d8529---63905454514.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/33067653805.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc2603abfd---75022309325.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/2119a48b0806ab4d6c52cea6caf5c981/daweli.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/kekulerakubimixeli.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609aae50922eb---43462887881.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/duzixuxurebowogivi.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/db96e0424b1b5f236afcf55466a969c0/javazogu.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/5961428776.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/38099729683.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_off0000e142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE142 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF954 16236 bytes
SHA-256: eefd4015fd112193799d338c7d73b40a113006f9cd881a23b5b07760e09aae3c
font_02_sfnt_off00012356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12356 10860 bytes
SHA-256: e45d483de2cb6ffb3817a6ace96b2a7aca51660a180601304bfcaf4bfc768de0

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