Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef6fadb4306e622c…

MALICIOUS

PDF

72.9 KB Created: 2021-09-25 17:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 54fdc9be9cb650de9691891ee3f45ba2 SHA-1: 86cbf6b521799b583395561213ec45a182f0a8c0 SHA-256: ef6fadb4306e622c09e9936e19119afc4cab7020e0667589895295ac49532e4f
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to lure users to malicious content. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or deliver a secondary payload, aligning with common phishing and malware delivery techniques. ClamAV detection further confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://rafautama.com/uploads/file/kamazivatugo.pdf In PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147dbec1a79b---towodotesoxiradunipob.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/zaxepamapejege.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/44570048297.pdfIn PDF document text
    • http://goopenapp.com/uploads/files/jozakenomutivimutaka.pdfIn PDF document text
    • http://roosprommenschenckelfoundation.nl/userfiles/file/natevawitoni.pdfIn PDF document text
    • http://pwharrison.com/userfiles/file/dilemomepuvoxaduxepo.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/vegagoparufo.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/mg4buhd809spl7v3ufiergr6ki/53876850969.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/08fe181c42a69391ea5ec759935ed762/medodolinuxuxujaduri.pdfIn PDF document text
    • http://gptools.net/userfiles/file/tiwotagije.pdfIn PDF document text
    • https://thietbigas.net/media/files/83527916079.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/9625614781.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/liwegigo.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/lomujutun.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/remufibadunop.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/sibexuper.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/lirafufarovesinavigep.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210917170223.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/libisubaboduzenovolune.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/88104240372.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/9658a90ee58a76d2dd1c493878753ba6/75791671895.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/majexokolodebafoweli.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142fe9c98d07---26245396935.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/14995651147.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=pratiyogita+darpan+august+2020+pdf+downloadPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A6 11084 bytes
SHA-256: 140af681414e6eaf2d71916b899fa1fd09884eff4bae62a624e3122bbe19bee6
font_01_sfnt_off0000ce7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7E 17924 bytes
SHA-256: 28bc4b53a8c2dd6000a433d8292edc16c7c87b67cd0301af8ff2bfaeb79ff639
font_02_sfnt_off0000fbe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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