Malicious PDF — malware analysis report

Static analysis result for SHA-256 f687d4c5f41a3cee…

MALICIOUS

PDF

81.1 KB Created: 2021-09-19 01:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f3c45a9dae30cfc8a0adc062a8c97074 SHA-1: 5e64c4ca945a8b2a3877bc1caf4cd6de34765905 SHA-256: f687d4c5f41a3cee16213cff0db8e5db75ec5ecb2aae47309b8513d089b3f258
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to disposable hosting, a common tactic for distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://mbzgogo.xyz/web/img/podborky/files/sofunekotojesore.pdf In PDF document text
    • http://emailreceptionist.net/userfiles/file/mitudasu.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/likepazapejojetaxogogeza.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/xorevimagibikiwu.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/03ac81a2a14c27aeb1bc258a1904472f/8980936412.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/83717789079.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210909203604.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/zefedebubusir.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/petizenasavotizu.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/ketasefinisigugevodibisef.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/pugupezizodabaredunapu.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/gugefatimivalulekis.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/xarobato.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/guxesebotubosasidamo.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/fedojowed.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/901c9f200e313ebfce65704f7802d866/ritoxufonovuditumid.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/54005919231.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/9136f762b4ec4443f6dacd6ec80ec347/noligixitunafavidavu.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/91107109632.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/61793847953.pdfIn PDF document text
    • http://iucecb.com/files/file/zawevatuxidapurizat.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/bibosijasejuvupivaxosida.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/79756777580.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/30836113122.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/30344387793.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/161384a100cc0b---gamarodebasuvetesuwobofen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=mobile+legends+rank+booster+hackPDF 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_off0000d890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD890 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A7 10876 bytes
SHA-256: 2242d922a5ec14378c61dd60438be3ceae3fe7d4b0c08dcf8516515acc3a76f2
font_02_sfnt_off00010981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10981 17544 bytes
SHA-256: 0007d54da2f3a90b6da376bac8533115ab1ba52497609b69b7955eef1662be21

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