Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8776f6012a9349c…

MALICIOUS

PDF

86.9 KB Created: 2021-09-16 08:35:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ccc15fa0c2bdebdba25acbf59d2ed822 SHA-1: ea26c9d391e1f0d8bbdcb5074ccd50c0bd2704dd SHA-256: b8776f6012a9349cc329d6737588311387814033dfc0dc768946d43b4b35c23a
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URLs, many of which are hosted on compromised websites or disposable domains, suggesting a phishing or malware distribution attempt. The presence of a visual download button further supports the lure of downloading a malicious payload. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • 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 https://philabc.ru/uplcv?utm_term=download+pes+2019+ppsspp+iso+file+for+pc PDF link annotation
    • http://elrey-uslugi.ru/media/file/pejuxiwaj.pdfIn PDF document text
    • http://186086.com/upload/files/fexer.pdfIn PDF document text
    • https://arkadas.yuzuktr.com/eskortarama.com/resimler/file/78989725610.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/2188449641.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/letopusobaxenimazuwa.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/20689839759.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/wuzinatiwepifiboxonuna.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/28953535209.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/nodubi.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131622b778e7---golefewimanikepim.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/60020415433.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/15137467909.pdfIn PDF document text
    • http://hybsch.it/upload/file/nuvusepidagadigepixe.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/3268861960.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/pelufeberi.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/neniduwizowiruk.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141aa5e0a50a---4203710489.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/0v5b09sbebnicp7qnfopr8vil5/menejiwesawagube.pdfIn PDF document text
    • http://2222.netsociality.com/upload/files/fatat.pdfIn PDF document text
    • https://fpcofmacon.com/nbloom/fckuploads/file/vokutajesotusubosemevawa.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/67637480923.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/18459445059.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/589af6ace51d36e7d87be71e45029a90/62137044921.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/74794162994.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/nopopubojizaxalobuj.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_off0000ed74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED74 11064 bytes
SHA-256: 45b067524fc3828bf087ff440a3823236f2cead484e6154d09b1a0c5eabdf2b5
font_01_sfnt_off00010772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10772 17788 bytes
SHA-256: ed91fe1b3452d2a8bb3262d9f9f4a397a194b4d3319dc1292746ae013ce82581
font_02_sfnt_off000135aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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