Malicious PDF — malware analysis report

Static analysis result for SHA-256 e20aa93c79982b18…

MALICIOUS

PDF

107.3 KB Created: 2021-06-26 03:36:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9f073791310ea234519ed51b99e3d38b SHA-1: f3bdf991c8ebb97d8a2e5b0150e705e2edf196db SHA-256: e20aa93c79982b1873ce19083ff32b9db8791a8a9c00f22ac5779711ba9fdf95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple compromised upload links suggests an attempt to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9698

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 http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf281347b72---dijozuleluvazokufemamov.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/322395e4a9140e776a9984e68af8e653/fenobete.pdf
    • http://slanfusa.org/clients/47225/File/37675662904.pdf
    • http://clarksville.net/wysiwygfiles/file/112440493.pdf
    • http://a-mega.ua/images/uploads/file/43228581514.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/4f84cbf541d1a21bdf88cef2710d9390/rulebodenumuvefivirop.pdf
    • http://optykglowacki.pl/obrazki/files/78679296024.pdf
    • http://esthebel.de/userfiles/file/mopuz.pdf
    • http://ctyrkolky-gamax.cz/data/dokumenty/sokisawo.pdf
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/dagumi.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/84cb4930608aeaa860a3398ecd89110c/poremesabopuxegodom.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2d4834279---guweguxakusinajizew.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e74be0fbff---48672122247.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2791cf0f3---lutumifinaxirowesepigax.pdf
    • http://ecohort.com/userfiles/files/zudoribavabironano.pdf
    • https://liniagdanskzydowo.pl/files/pitejatumasazirivixutoju.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4e0d5360b---52746675384.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/76197dthus9ohogolhacneh646/kulojokixonikapuluwupe.pdf
    • http://csc-020.com/userfiles/file/20210607021848_g5cygi.pdf
    • http://armanetti.com/images/tumovokimez.pdf
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/teliluku.pdf
    • http://sl-light.ru/design/img/upload/file/xiwasojabu.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160adca7e3e632---zuxulenekavenor.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce12aac502---sizuzij.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=quell+your+fears
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00011add.bin
3984d2e519250a5617f933bae84ba6f562e5637cb92ab13de1ca838129fb34e3		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11ADD 19472 bytes
font_00_sfnt_off000103c9.bin
c8bce4017e1f5c2ba3780507986c2693d250f01af94797b169f948a34614ec7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103C9 10188 bytes
font_02_sfnt_off00013b39.bin
572b2570833ac56a262e85efca4631878476f1b81dd8e169eff9d15a708212f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B39 25340 bytes
font_03_sfnt_off000179e2.bin
757321c6d039255aaa53db0ce5bb5b4b7b60726c119a426bc1ad81fa068073ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x179E2 2740 bytes
font_04_sfnt_off0001858d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1858D 16792 bytes

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