Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d70960fc062b8a…

MALICIOUS

PDF

101.1 KB Created: 2021-06-29 19:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7845907c1c62407ece3852530ea09b98 SHA-1: 467c20895907829e8ed13943867973bbdf587287 SHA-256: a6d70960fc062b8aa09ef2cf578be35e84e4dda789a97c62cc711247e81724a1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for malicious PDFs to redirect users to external sites. The PDF also exhibits characteristics of a link farm on disposable hosting, suggesting an attempt to distribute malicious content or phishing lures. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9803

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=business+analyst+interview+questions+and+answers+for+freshers+pdf PDF link annotation
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/0c10ac33ce19aff76878e247fe457cd0/buvelosebogup.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a25eeab3166---wulekugedunomimuxugag.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991da21e863---demogiferifeso.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/78391127086.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/a8923efbe13686fa3fabb1f2a0e3012e/40107532000.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/tibelaf.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10b4405e4b---nasekikav.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/diget.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/c759d725594e04422d4ab3acf2a1b9bf/71440402560.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d4b8273c8---nomikakixukazo.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609131c2cb411---xidutijeviragaju.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/tg93jdkiupka2bl559ujjga460/16676468517.pdfIn PDF document text
    • https://olterus.org/contents//files/57714784126.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a35cd687595---6923692112.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/14541901579.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/opldr5g1ol4uqvmcll66v8oa34/pedamalobisarapabeze.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/d77bfb8ad56dfee58b88335c199dba00/kugonalolapezigupi.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160abd415e538d---lazipigomubowo.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/75793983075.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/54834660904.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/2735274423.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/31445923288.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/kiluvanetawasominu.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c95b6c8b7d---92644119920.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5735bd4ef---pevesegibonowi.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/dagufebun.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_off000127bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BD 11160 bytes
SHA-256: 197124eb8e7e906961741a68a25a7cd9f7a7d33cd315bf52ab7f7b0d76331a3f
font_01_sfnt_off000141af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141AF 16952 bytes
SHA-256: d53b3db224d1ad3b029f3af41e45586ba898796526b6ad1eee0870438620595c
font_02_sfnt_off00016ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1