Malicious PDF — malware analysis report

Static analysis result for SHA-256 97a21b1e12a5f4a0…

MALICIOUS

PDF

80.6 KB Created: 2021-09-11 08:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f861e26d3feb15f0c50edaad9216cd69 SHA-1: 3d67588d6dc1e6aa4c587e1a5bd7463fd3885020 SHA-256: 97a21b1e12a5f4a0a66e1318c94d60ccb20c2bc16905dadc03f11138881f872d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDF documents. The PDF also functions as a link farm, directing users to various external URLs, some of which are hosted on compromised websites. These links likely lead to phishing pages or further malware downloads, as indicated by the ML classifier and ClamAV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.stadion-zarya.ru/ckfinder/userfiles/files/8383542119.pdf In PDF document text
    • http://fotocaroli.it/userfiles/files/5929842852.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/tirizapavabarepufip.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/jozogiwemivexutik.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/05580b2d9a9ae41c561634514ad031cd/risalefuxiwoluliliguwur.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/61928212153.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/3a94e0d497d689f6bdfc7643ee859c31/27993616947.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/texavu.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/zevapuwuxajoxu.pdfIn PDF document text
    • https://magnanerie-cazilhac.com/userfiles/file/fawugekegujawobururoba.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/98053158424.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/66839c7eea8f13934cbf5c18ea01e4b8/23489011791.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/wuvet.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090800040171333.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109100551229985.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/24132466365.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/nivisuzumakufajeji.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/92669902519.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/k6j8vaq5e9sivcifiae4vibdaa/fafafajegofosageja.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109042254037756.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+allow+apps+to+install+on+androidPDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210904/16307596089571.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_off0000d681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD681 17860 bytes
SHA-256: f29633fb5a22fb7a6fe21e085be105b8034ec42378cd05f592cd9d38042b552a
font_01_sfnt_off0001055e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055E 10332 bytes
SHA-256: b6b6019f0976a4b5ff7ece7667034f07ebe3e3375756320df0c2d7cad8880061
font_02_sfnt_off00011cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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