Malicious PDF — malware analysis report

Static analysis result for SHA-256 91890188a3c2337a…

MALICIOUS

PDF

89.4 KB Created: 2021-06-29 07:12:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: be93db32b19ae0eac3d597282d541e4d SHA-1: a91a088d0816a8e1726fd3df5e056300097ce6f9 SHA-256: 91890188a3c2337a335cd496689d70be5b12ffa2328462dd1d7c09e6eb395fe7
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories, suggesting a link farm designed to host malicious content or redirect users. The 'SE_CALLBACK_LURE' heuristic further suggests a phishing or tech-support scam pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e607038849---54189425760.pdf In PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/vumufufosu.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160706b0b25f7e---6243915749.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083202334e3a---45236441316.pdfIn PDF document text
    • http://leguido.net/files/zapunikanijibowam.pdfIn PDF document text
    • http://miracleschoolministries.com/survey/userfiles/files/zuvamupexugo.pdfIn PDF document text
    • https://tahubunting1.com/contents//files/55521843950.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/2f93f26dda54a89df408b9e9528757f9/runakefabilatanepabutime.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f342c1fd0f---fakamatipiv.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/17387203796.pdfIn PDF document text
    • https://susta.vn/userfiles/file/salajifuxanitebo.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/nofebubidobafasaxe.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/jebosonakogigijunidoju.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/gefarazakalinisakid.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16097a2e9a4d55---konoxupatamivivokipenej.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5fee3c19ac9f1e4ca04801bfd7f5de14/tijapavovef.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/gebapipajujoredewobaxala.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/b331a166a390f313594d473b9386637c/24167838094.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d77ecb3be---galapilunat.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb372458e4---36279916575.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a829d842d---rolozatipugagowatuwol.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/xidokurasixif.pdfIn PDF document text
    • http://fabtur.ru/upload/files/93405950501.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/1dab625bbfe9f4dfc71c50bceee50c25/68830626823.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=which+airport+is+named+after+a+pilot+who+shot+down+airplanes+in+world+war+iiPDF link annotation
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF504 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D16 18004 bytes
SHA-256: 7c6fa9eed800fc26f6b7e1d80437120ded20229b5bd7a41aa38738828d998680
font_02_sfnt_off00013c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C2C 10964 bytes
SHA-256: 13e64a3a616587263c132e79d36ab4cb0ef4691e9db1be9c6d4d7dd6680b3258

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