Malicious PDF — malware analysis report

Static analysis result for SHA-256 fec7959d4a6d498d…

MALICIOUS

PDF

104.8 KB Created: 2021-09-18 08:38:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3bb3867a651395362a7ba197dd7c4dc8 SHA-1: c5272ba96209e47991ff36bde0e6d7e2205b37e3 SHA-256: fec7959d4a6d498d9aeca369cbcaad6596ac05d18059eb15c9a1220faf583573
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, suggesting a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery. The embedded JavaScript is likely used to facilitate the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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 https://philabc.ru/uplcv?utm_term=rich+dad+poor+dad+pdf+free PDF link annotation
    • http://moristas.com/userfiles/files/67561696314.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/5417326742.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/3164780822.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/butopuw.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/38978057618.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/20811559473.pdfIn PDF document text
    • http://one9five.com/userfiles/files/gejekubagajokatuxegajup.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/gagalimigib.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4c681fa65---96075896173.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/riwipevipefibur.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/11003502073.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/161365a91edecf---dalitovowepovu.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/wapirokixofesi.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/37912149902.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/jiduluzuzunotik.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/xolavapigun.pdfIn PDF document text
    • http://caythuocnam.org/images/files/tisit.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/ditawuxiniguzazu.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/jinegizi.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/jinawudebuborasawubujeka.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/76626304437.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/turibagaxolanubopurexok.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/1360013829.pdfIn PDF document text
    • http://vitajeans.com/ckfinder/userfiles/files/nuwosuzukep.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/45147573be4dcc8e830eef99d6fa66da/pilifegimobajuxixini.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/gonefidaratategamolukogij.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_off0001331c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1331C 10344 bytes
SHA-256: 50b324a38c97f1ff652628425b5c87a35e4f6f618bdd8b3c0e1e47589192613f
font_01_sfnt_off00014a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A91 19532 bytes
SHA-256: 2e11aea7568208d4de030e5c6fe391d1fcb8d4c1c88c2b07ba4b2e375475d869
font_02_sfnt_off00017dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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