Malicious PDF — malware analysis report

Static analysis result for SHA-256 2437d56f5999795d…

MALICIOUS

PDF

89.2 KB Created: 2021-07-23 21:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 1ec5c9cb25274aafe3a46997253b86cd SHA-1: 2ee88d4a3984e1c9a433b66017db5268b6b16ce3 SHA-256: 2437d56f5999795d85855eee9c7db5b167d6a94f9f1dd35853472a72548ee66c
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9795

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1d83acb63---mejegilinuvudimo.pdf In PDF document text
    • https://myphambambi.com/webroot/img/files/79125310686.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca12868cfe---60914116392.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/ronoxoxojolofemozosot.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/737a854e89677dbd2f658f30dca94766/paneva.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b97b6080708---dapulevivajoz.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608195a101486---6716588729.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/zakegup.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f41ad21150---91803956099.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/lugeretegazogekes.pdfIn PDF document text
    • http://qca.ch/userfiles/file/17059200699.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d2e12ecad---69739371132.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/jejoborunazekesawa.pdfIn PDF document text
    • http://artside.org/data/temp/file/kipepezefurogogenotipe.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/5g92okag5pev9akfvdd3mi34p5/56453857935.pdfIn PDF document text
    • http://baobiachau.com/luutru/files/52802352417.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/39b304d1ed10230aa9be07a0f876a350/29345419521.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/791159845.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa11f9ae1d---66381890024.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/risow.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/5c004ea0361ab2029ef249b9afd859d7/futirokiwomarus.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c643ebefc---68441543203.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/laxakipasifi.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/tededova.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/887619878.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/d266d96f8b0e75ec6f1a24f5402ba5be/69159478205.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160791c67a321c---juwovabikututupusopon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=what+font+is+used+in+super+smash+brosPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE305 16084 bytes
SHA-256: c27fafdda185be2695e99106f22849c7304d1d4eff2202c3575f3979fbde09eb
font_01_sfnt_off0000f83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001104c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104C 17236 bytes
SHA-256: cae7860ceaee259cafc147cdeccee60fcce0f6b1f716fef27ee51475be6aa9e8
font_03_sfnt_off00013d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D2D 10952 bytes
SHA-256: c11c6ff45ea814c180a621e0ba06cb0e23c1b623e8f0338ddc322746718f84da