Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a0a49160a8a0d72…

MALICIOUS

PDF

79.8 KB Created: 2021-09-18 06:13:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 3c915b451c3014f2efb83df16863dc6e SHA-1: a949b26522e80cbd25dd02cf3ad6f7583f20e2a0 SHA-256: 5a0a49160a8a0d727d1f399f5830bcd94d40ec780edcf8f6db570c76114803bb
184 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URLs, including those hosted on compromised WordPress sites and disposable domains, suggests an attempt to redirect users to phishing or scam content. The 'SE_CALLBACK_LURE' heuristic specifically points to a callback phishing or tech-support scam pretext, likely facilitated by the embedded JavaScript to initiate the attack chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crewmak.ru/uplcv?utm_term=how+to+add+second+email+to+android+phone PDF link annotation
    • http://bilafafafa.com/shopadmin/upload/files/9835341661.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/obstsqj4qlb4bvo6iq2jv86ucl/lometitegosezotapirez.pdfIn PDF document text
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/vobilirifavozu.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/69334441614.pdfIn PDF document text
    • http://specialcats.nl/media/files/danugiganixuwikotubi.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/supeniberasenu.pdfIn PDF document text
    • https://kakakmanis.com/contents/files/96252923498.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/161309efba076d---10490309572.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/34347513284.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/namilogibudone.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/wosofovobigudawafumugamu.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef105a1ec9---76890031773.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/wibarilidimo.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/11334306003.pdfIn PDF document text
    • https://iwistw.com/upload/files/namaboles.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/86793946819.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/jumisolanugilif.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d22b11d53---futapubezoneduzozukow.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/11529872602.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16139e26d4fb18---20942693992.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/zajere.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/51352189124.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/1aa110ab83cffc2731f92a9782ef84ad/21186863016.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_off0000d57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57B 16564 bytes
SHA-256: b0ddf991cc61dc1ae93adba931ab35d9d52ed90c87da107e8002006e82b4fd55
font_01_sfnt_off0001006e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006E 10856 bytes
SHA-256: c02eb9644768e77ae3eaa90595be84adc262459439ea47c163ad9043b236b3ac
font_02_sfnt_off00011946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11946 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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