Malicious PDF — malware analysis report

Static analysis result for SHA-256 090b0e6ea5c5338b…

MALICIOUS

PDF

92.0 KB Created: 2021-07-10 01:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 170044dd2b1ddd2a81647b9a0d70e46f SHA-1: 98afd79488972b0af59ae77b2eed479ad1c902a1 SHA-256: 090b0e6ea5c5338b4a667c7253c7ca590cf09949a7d24b44268847a58d41413b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, designed to lure users to external sites. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/8593cf1f3f69f20c6cd6ec01c686894b/sarelu.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821badf11b1---jagonujatulir.pdf
    • http://ypperfect.com/ckfinder/userfiles/files/66433724404.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/9tunbp1968kuh0mfqdd9i9eddj/65881966114.pdf
    • https://alakharia.com/public_html/userfiles/file/panasomo.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082adeaae14f---xijerojesujoratederuf.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b19c3766d---2558923314.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/43d79e3550533e101a6b69c3ea242e31/dofiloleserigufogosodop.pdf
    • http://asea-admin.com/_userfiles/file/20210502113115.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/vlsrfij5f0sanp4pi3p9au2qo1/24590289291.pdf
    • https://vettercycles.ch/userfiles/files/68711506271.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd8df367656---jedodazulobakebibapuvom.pdf
    • http://bertoniamministrazione.it/bertoni/public/file/ludaniwapazomez.pdf
    • http://hersheyhigh1981.com/clients/37302/File/60212403137.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c43b7ea795b---83315830255.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a345e105809---14613728058.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d29251b319b---waxonakeramomuzoze.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/fr6hpf9rk5v8bitb67kr1rh4g7/67168795041.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/cba4ac4219734ed1496c0267053125df/17704628073.pdf
    • http://kingalbertltd.com/uploadedfiles/file/wobemujinegetaluvel.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/t92ujlhdbauhpor38r1961fql3/79114628145.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/88157f42dcd626f3bbe71a8ffc9c6a52/68257311570.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22036f1548---30619249113.pdf
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/45137732377.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=the+cancer+causing+chemicals+are+called
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x107FC 16792 bytes
font_01_sfnt_off0001200e.bin
026c2fbc27d1bad8e946db2daa9e8ef302a11d4adb4ba0eb6eb7c54dc23a6499
pdf-font-stream PDF embedded font (sfnt) at offset 0x1200E 16548 bytes
font_02_sfnt_off00014ae4.bin
032f35a115f1c6b79d396f9f03a112908b6a7c69fdf15a56e392af4fa029b0c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x14AE4 10664 bytes