Malicious PDF — malware analysis report

Static analysis result for SHA-256 caadd9fb2bd5ca53…

MALICIOUS

PDF

79.6 KB Created: 2021-09-15 19:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 32ad085fbe8106c53c47584679e6690f SHA-1: 23e7aebac71e53e8fd08df7ba9eea5e93a0c9381 SHA-256: caadd9fb2bd5ca53e84e22e14418bcf61ad54a3923926d99817596c298e54bff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. These links are likely intended to lure users into downloading further malicious content or to phish for credentials. No scripts were extracted, but the structure suggests a malicious redirection or download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://exclusivelimoservice.com/ckfinder/userfiles/files/11220333739.pdf In PDF document text
    • http://jsushibrea.com/uploads/files/31774365699.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/47278859700.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/58766270876.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/buruxerat.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-11/20210911121558815574.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367202a68f3---lujovixefogelolipuxuj.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/witipejupogonoguxor.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/fonozowosixowag.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/17904871814.pdfIn PDF document text
    • http://pinxedien.net/upload/files/70336275806.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/faxosoxegumiwuwakofugowi.pdfIn PDF document text
    • https://blugarden.eu/file/namadosutenapovoxa.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/85998376807.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a8bd6aa60---fetepelikopu.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/jufimuwemelenujeba.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314d094eb37---sapeteputadofafuz.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/8323919032.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/xuweperoje.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210908_78B47D126E25991A.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/jofezewoverediwenorawova.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/ropusevafigelir.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210908032258_1607039097.pdfIn PDF document text
    • https://tekartltd.com/upload/files/27440583067.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/0fe4a8afef29d3644e4d9dc880d4788a/93824348159.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=true+skate+mod+apk+unlock+all+skateparkPDF 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_off0000d464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD464 16576 bytes
SHA-256: 0f730abdaf89e71da37676cbde7fc875f8f6a7f996921d1495e29499a48b17c1
font_01_sfnt_off0000ff3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11756 10736 bytes
SHA-256: 75ef4724738adde2d8e9ab392e9c7bbd3e66d8936a566008ba77334c278f4362

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