Malicious PDF — malware analysis report

Static analysis result for SHA-256 886bc3cd324a7f49…

MALICIOUS

PDF

80.8 KB Created: 2021-09-18 20:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 97522ca2cb961b7143284e7cf94fda8e SHA-1: ad633f2f91c5126bbe3048c4b90872b273377053 SHA-256: 886bc3cd324a7f4997642ae72d6699bdb583af5412d59811bfe12c80e691142e
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many hosted on compromised WordPress sites, suggesting it's designed to lure victims. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's content likely prompts users for sensitive recovery information, aligning with phishing tactics. The ML classifier's high score further supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.
  • 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://smidgel.ru/uplcv?utm_term=android+studio+generate+pdf PDF link annotation
    • http://popnmusic.fr/userfiles/file/42773924286.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/7073932919.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/cdfd07e6433d59f3e6054822adce07ce/sebavajem.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/45081564485.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0a9b127e3---fosemiwoges.pdfIn PDF document text
    • http://vandofigueiredo.com/userfiles/file///baxatoxetikixajuxupow.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613292406076e---fuxevidoxotawumudadirepa.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/wotogosorukesatibil.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210902083204.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/nidafitonupitagose.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109030206199375.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/0477f2542cf7e1276efbbfa0c0906f9c/poloxagi.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/e35u22bs2pdve55g42efletus3/mozojepik.pdfIn PDF document text
    • https://phukienbep.net/media/files/12288527812.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210904215412.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/f51b6484c7549ef7135856d88abf82da/dizufizot.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/11226372744.pdfIn PDF document text
    • http://195exim.com/datas/files/nigakapefagovax.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/ruwepomomivavixefimobup.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16144a1f4aba43---widebududojotam.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210918153833.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/tiliteto.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_off0000d907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD907 10708 bytes
SHA-256: fc8028328456a1a599a5ad1da6ff992a335ad643e7b5ee03cddc42d701c891be
font_01_sfnt_off0000f198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF198 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AA 16964 bytes
SHA-256: bbc413e521540a83387b70836291098ff8dac18f3b46dda4475e20f13d43c53d

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