Malicious PDF — malware analysis report

Static analysis result for SHA-256 2386ae7f11be7d1d…

MALICIOUS

PDF

92.5 KB Created: 2021-07-14 07:37:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ef91371054617e2b35c848a3e1726c94 SHA-1: 7befcfd1ff30e17b083648a01b6fd54978711340 SHA-256: 2386ae7f11be7d1d3a8b5ca66fd55110c181b8f02af0ae115f75118aa08090d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 6

  • 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.
  • 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://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16070ebacb8461---96139628294.pdf In PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/e1ceffc163a7fba6f7a92c4eded8d288/bijesuponi.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/sanim.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/rotodolebelesaf.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/nokasetenutodepot.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/75878571731.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c230bb1903b---71244336962.pdfIn PDF document text
    • http://whewfamily.com/clients/12004/File/sosabigorujipit.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/didokamasibor.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e6cbad7aeeb---34197799983.pdfIn PDF document text
    • http://littlefreddieking.com/clients/65037/File/muwuru.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbeb902ca0---bakarozub.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1623245462.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608309c00c826---88690571379.pdfIn PDF document text
    • http://df-2.de/images/daten/file/16577210528.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721d4faae80---nenofubaxurumubo.pdfIn PDF document text
    • http://primaneighbors.com/userimages/kejivukagoriboduwitojabid.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730f9104590---21605205683.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210603195525.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2914f8cb56---23583056892.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/89477484632.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/36520508134.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/149551470aeca5094a9c8188a43bdb24.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/766f27588bfe0bddc9c0269c4fa432b5/gomavezexodup.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/dn5fj4viptural5c7p2jbvmul0/pifovofamerobejinitorew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=pruritic+papules+of+pregnancyPDF 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_off0000ef1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1D 16092 bytes
SHA-256: 98bcec2be85b547d266a48c61dccc50816b624367bf69e2f194f2b8087d010f5
font_01_sfnt_off0001045e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C70 17740 bytes
SHA-256: c11773d1faa997242feb4f478cc2597c7b27ad72acf67d8d4c4fd8b2119f659b
font_03_sfnt_off00014b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B1D 10872 bytes
SHA-256: 2cdcd577a01fd366a72bae1f767df9759bf0cc107e523b77877005288839f21c

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