Malicious PDF — malware analysis report

Static analysis result for SHA-256 053ceb661e764a9f…

MALICIOUS

PDF

185.3 KB Created: 2021-06-26 19:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: bf5a063b17ac794b9fc7446fb486bc18 SHA-1: e3d6a0870ca215faf155db9f8a6ba7133cee730d SHA-256: 053ceb661e764a9f51e8f4fe830badd0a2567f14e6e0059adc42b19e5e57f29d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it functions as a link farm to distribute malicious content. The document body is heavily obfuscated and unreadable, but the presence of multiple links to disposable hosting and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://synerhu.ru/uplcv?utm_term=carl+jung+personality+development PDF link annotation
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/3f5b67c2b51120b1faf36954ca284a3e/zejoxetamobolokikodufe.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/71360765390.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778e5a03378---lorowasuniretelasawovo.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/t2jb0od6kqf5qu0l0khe19dsvt/75143642901.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/nuzapija.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/nofumobesenuvupazufu.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/8344315496.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/fcd12eb404dffe01f165ee13890542c0/41776048724.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/4513058b97d0d6893a9888c451bc5e33/46862133491.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/nuzagopitaluda.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cd6cb789082---xogitozuvarugokawew.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/wubojukibifomexelu.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/19fb3bf9df7647828c25a2ff970ab7f0/xobiguletufuxegud.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f36cf50a16---wuperizemuwuwasemavuverax.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/vulanunoxagage.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/k8kqudiv3bvd9oulc654192d59/banuwedurev.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/woxisufujosatujigi.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/fapixamesodufag.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/rjcbtmjk7th1lqp13paqj53eu5/bulofo.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/0ab8ffd1bc3fb7291e2f651f71769f0e/72019313647.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d71c8eec71---wakupenefur.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070bd21ae4eb---xupibenafalamitisiromevo.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e0a474e84---5966224513.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_off00027192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27192 20440 bytes
SHA-256: 0a5643f6edc70d48fcb9206f057bb8bcb083448cd8d5d9594cb79d292187c68e
font_01_sfnt_off0002a5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A5A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002bdbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BDBE 11176 bytes
SHA-256: 7cb1a3d0de13c8f8fb324434510f41450183605e61a686d6dd9fcfabfc90f71f

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