Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dbce59190dc1c36…

MALICIOUS

PDF

89.2 KB Created: 2021-05-29 10:54:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99ea6cf9b14e8ed7fa7d0b26204fe963 SHA-1: 43f9f5baae6ff05af58055e4447830bb051ba32e SHA-256: 8dbce59190dc1c36b0faf03ace733ecd7d622b7ab8e69ba8d6c5031b84074e1a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document exhibits characteristics of a callback phishing scam, as indicated by the 'SE_CALLBACK_LURE' heuristic and the presence of multiple URLs pointing to compromised WordPress sites. The document body, though heavily obfuscated, contains text related to package activation codes, suggesting a lure to trick users into contacting a malicious entity. The ML classifier and ClamAV detection further support its malicious nature, likely serving as a delivery mechanism for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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.
  • 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://laborke.ru/uplcv?utm_term=batelco+large+international+package+activation+code
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/2698d1cb1376df61af1fb491f1d97868/bowebonitosez.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/ec15f39dc8e2f6e0777bbe0a7a9a379d/37373278956.pdf
    • http://ztkammer.at/uploads/file/dapukufajesirado.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863bd3050fe---nemipazigosodoroju.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf01d55fba---vonelukuma.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824ecbd56f0---36810841206.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/de1580d3402ecf9a13f56a1a7ca13724/natagitaragelu.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73e83b6537---25060291322.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a69d051cb1---72061689571.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/9fce004a8e04bbc4f79adc392c150ecf/xonenek.pdf
    • http://anhuifan.com/upload_fck/file/2021-5-4/20210504152136653153.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c420e5c31e---68578347082.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072655d12f98---10442322318.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/11698378805a7b46eadb4be993eef400/nipokubobukog.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cb9bb8bde---sutupene.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160758092ee2be---62702884615.pdf
    • http://akkoryazilim.com/userfiles/file/95822877656.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000136fb.bin
a572a3aa5cb774b729d4711e406c5e2fb7ed28865e095446501b7470112857ec		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x136FB 19776 bytes
font_00_sfnt_off0000f859.bin
70443d6bd3d0ca6709e32972396f225fb73f4e7a4e3ca343ca18f62c2b093e95		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF859 5236 bytes
font_01_sfnt_off00010a3a.bin
5085f533b6d92d548222f05890709019e720221fa13f3575614dbaa6440256be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3A 13672 bytes

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