Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb36dbaecd1b34b1…

MALICIOUS

PDF

91.8 KB Created: 2021-07-01 23:23:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: aab2973d4d1338337ab1867d5e524572 SHA-1: c00faa94bbbcf5df649b42309f58bac4bf0d9891 SHA-256: eb36dbaecd1b34b1d513853f907c1e442093eb837835e35eccd389c452851b4e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. The 'SE_CALLBACK_LURE' heuristic indicates a potential callback phishing or tech-support scam pattern, although the document body itself is heavily obfuscated and unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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) or Microsoft license-boilerplate 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://alkalacarservice.com/public_html/userfiles/file/11892045283.pdf In PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c725daadd---sadiwu.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/151287619972b2a83bae4e51a97cd634/kenerak.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/lagusafakakazipazuw.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/a3faf51af01563e16bc8d3970abaedea/44619282664.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d051bd84ba2---55882170765.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/33848ede5c67b3368d53d8f43a0448ac/didifokewizulopofadiro.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7e187de6e---lunijizodizatifogolew.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/91665068828.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/lukanaso.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608459e586681---fagegigonutilunusonaf.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/munutinanilinamuziguzu.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/raxunimanojepifutagavu.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/gudaxigikowu.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/juclpeenh6a1aiv0anjt0k71ga/linuruba.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608126e1df205---16593868945.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/fhgcv1j44ev39nqursoch6ilnm/35819709851.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607f30d5288c1---23534811952.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/578a63119014212d0d8c34866bf884e6/dekusorulifirup.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/36f38381f34eec53528ef10f960892bd/52693989756.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dac9e7ceb1---9869415754.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607305af3b7c9---buron.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afdad36040b---72874761337.pdfIn PDF document text
    • http://smartarts.bg/userfiles/file/zerekosomitil.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/6992c92d518cb954014eac188b7b8c22/34997064756.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/rowiluv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=manual+testing+course+durationPDF 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_off000102c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C2 18136 bytes
SHA-256: 3f4229a588bd0eab4846b87687e598f183e068440f062c08d28c3acc4732bbdd
font_01_sfnt_off00013161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13161 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14978 10640 bytes
SHA-256: 0f65c18e8fce5275a6f4adc87ab0a4a4c0dbcc25247746ea45218c5e9898133f

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