Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ea76b4e83b5afc5…

MALICIOUS

PDF

94.0 KB Created: 2021-08-04 08:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 00730c36c18644665e5b939b1ff0c766 SHA-1: 460417f3ed58ed7f41269a3810168cc81b468fd5 SHA-256: 5ea76b4e83b5afc57e38414d478fbc657ed8fc3762bc944a3bdc87efc3e66af9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=what+to+write+on+resume+for+cocktail+waitress PDF link annotation
    • http://webbuilders.com/files/file/gegosebufezabaf.pdfIn PDF document text
    • http://elskenecologie.nl/files/jexogej.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/tabinivulubenawa.pdfIn PDF document text
    • http://195exim.com/datas/files/fizubujolo.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160921f572e4fa---35980277305.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/89823954032.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/fc5e6d6f7a70b4bb95b0a2e65b2b83dc/vajaxoduxisipuxi.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/99711440443.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/83d85199df81900d1f4331bf0f92bbe5/18979089865.pdfIn PDF document text
    • https://aashianarealty.com/file/72542150346.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/rasawadofukexabezis.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/blffj29degl1pkpe22v0ks3jc2/genokas.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/xakidezogobuwixoteboje.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/81647fd5f12be49b5144f9dd0a848d87/88108477174.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/pogozalonikumu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986cc4bc0ea---xusisudul.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/047qmkujig5slm2974aqaf2ls4/wufetexug.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b65edb63b1---63073671771.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210715144210.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160adf4490c688---36941102758.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/067878d1597954b4d235ee0d4ea95486/24500993357.pdfIn PDF document text
    • http://lhsclassof68.com/clients/73441/File/poridiriz.pdfIn PDF document text
    • http://nktrading.qa/file/files/7674208388.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_off00010a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9B 10872 bytes
SHA-256: 71a8274096b39f5941991152ca831c476ab1fe943cea6787d52970f95fbb03b3
font_01_sfnt_off000123a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A0 17268 bytes
SHA-256: 18a60246e4b8e0bfb534e84d2d87e50b1ee8bcedec33706585989c8d6189b52f
font_02_sfnt_off000150e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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