Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b02313d30ecb7b9…

MALICIOUS

PDF

86.8 KB Created: 2021-08-20 01:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0933f28ec68c8ce08e40b6c122621716 SHA-1: 654b409ee5ca6c640773e180a6a695f8eed80c91 SHA-256: 4b02313d30ecb7b911cea0e3dc68e0d41ea59aa184654559d754f750514d745e
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple heuristics indicating malicious intent, including a link farm on disposable hosting and a high ML classifier score. The presence of a 'Password-protected archive handoff' heuristic strongly suggests the document is a lure to trick users into downloading a password-protected payload, likely to bypass gateway scanning. The document body is heavily obfuscated, preventing a direct analysis of its content, but the heuristics and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://willes-gb.com/uploads//files/202108040513598493.pdf In PDF document text
    • https://aynispirit.nl/userfiles/file/ziwenivirufipem.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0bce8a512---fabolulalomosijozopo.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/jub881d6acgmmiacm2cc6i2a4d/24878810207.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/48917391467.pdfIn PDF document text
    • https://medpressa.ru/files/file/jesonagutasubuvijazag.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/19010684213.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cc40e76211a---13176948464.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/babobefabadobub.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/mirnb6b8ftpisvmj6q08ae2hiq/lemikowerulamaji.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/61462855159.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/35fd9f1cf14589470f025e3fceb55133/26868936068.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce727b5900---kuniba.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/vizaki.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ab82c3a82e---gokolaworasavojodan.pdfIn PDF document text
    • https://migger.dk/userimages/file/vogujuxa.pdfIn PDF document text
    • https://wonkingchina.com/d/files/77167996580.pdfIn PDF document text
    • https://yuh-tarng.com/userfiles/file/rosisale.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/qfuk92d98nkbn0scldqkuqehqj/rorefikanigufumomozutezo.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/36926913552.pdfIn PDF document text
    • http://world-system-packet.com/userfiles/file/53404014829.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7d1c383c9---jutafexegidivu.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/mitamexegiwojosowaxaxinu.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/rejinotumewakevu.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/masiwaroseminifosop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=free+fire+hack+mod+apk+download+unlimited+diamondsPDF 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_off0000e982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE982 17880 bytes
SHA-256: 39fad42ef37db135f32c2f95f8c162905ee147301a2f4cbc31eb20ac4711720a
font_01_sfnt_off00011877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11877 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001308e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1308E 11140 bytes
SHA-256: b13ef3a9fe0732d04e83b7e3142115ccda98082336de7d5c7f23571cdd445440

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