Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2fb65c74d9db3b1…

MALICIOUS

PDF

81.0 KB Created: 2021-08-29 11:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5b7b27cda9826179dd06e4a2dc632f13 SHA-1: 74e74c62009030b0c2a04df6f7ea08e5a428e8aa SHA-256: c2fb65c74d9db3b13755a09214e0a4d165b77cb002577eb65d8495923c111115
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for initiating malicious actions. It also contains a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or download of further payloads, contributing to the overall phishing or malware distribution goal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://catamma.ru/uplcv?utm_term=michael+coker+for+state+committeeman PDF link annotation
    • http://ekvatorbl.com/userfiles/file/raduvijumoxerobifilunuxo.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908b4eed343---tupizal.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a9d25167c---73056866042.pdfIn PDF document text
    • https://chp-travel.ir/data/file/butujaborixuwiza.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b99a606bf09---dekule.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/70256514429.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34f2a7d757---57603391187.pdfIn PDF document text
    • http://cbafjvn.com/uploads/userfiles/file/dejojuwus.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210611211024_tsecxc.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/34912840145.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/mikalufixalix.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/79660451039.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/zonogajurofu.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/63372375950.pdfIn PDF document text
    • http://stroi-sistema.ru/img/44945122783.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/h9i7rbiul3uplnqqi2j2i1un05/63912252881.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/7a0c6a00becb9477c6d00fc3ba206e94/17960912160.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609af74b26892---woduvebowonelujuxogoxuta.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/tipijoja.pdfIn PDF document text
    • http://soles2walk.cz/data/file/fopovosavaxidep.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/ad273a649b774c4df62fe44a62d185f9/48249504645.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608332191eee7---88427421344.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/pajisojogikijatogaju.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16114c42058533---25213676618.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_off0000dc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC38 16268 bytes
SHA-256: a292c2ef665ec42bc45ef1cc868f32cce2c4fd73eb24fb1e785e9c9a1393ee45
font_01_sfnt_off0001065f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065F 10684 bytes
SHA-256: c9ccf2ba1d2a4319ca3e912a964c80e268b52bfb8bb88a8d8d96d9be325d687d
font_02_sfnt_off00011eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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