Malicious PDF — malware analysis report

Static analysis result for SHA-256 facf057ea1efb43b…

MALICIOUS

PDF

81.3 KB Created: 2021-09-06 22:42:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 373bb3f95d3a81180ac461c42e2fbe49 SHA-1: 355d746dfdf39f5f5d944776e8a0c5bf472ab2fe SHA-256: facf057ea1efb43bf32d176be0e3e2872afe5b9bfa34230d0f5d9eea28af46dc
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The document body is heavily obfuscated and unreadable, suggesting it's not intended for human consumption but rather to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://hanyauntuktesting.com/contents//files/kojasatudugodiguwiwove.pdf In PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a452e3732---pidafem.pdfIn PDF document text
    • http://ekorob.pl/userfiles/file/mubadeseredi.pdfIn PDF document text
    • http://cfacgroup.com/uploads/FCK_files/file/84757195855.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/45153886714.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/vujerariximune.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4d4bc2600---guwad.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/14bb5a288836ac8dd6c02bfa3032fd60/18147072284.pdfIn PDF document text
    • http://songiadabinhphuoc.com/upload/ck/files/xuxobivipawasenolavuzaxe.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/kozafakinorubiwowopawo.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/97046530876.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/zawurinixotajutujud.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/30bbdttvpob3honu2428pugup9/65748799017.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/revurefivafonegekomo.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb8b7a077f---90104923838.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/guxofumafimo.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/lj8tbk3jbns90tiaoo9ekpk4j3/poseparum.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/71284712130.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/9a000660af71afeabd0913825da645aa/luvawitiromewukazutabo.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/a3905b2700232fe13db11fd2fd27f06d/74415416220.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/1f1b17f76a2fdcb12fc00e8c7ee97f32/19536888285.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/d84bcbeeffb3ba9534526537fa90dbea/52557572868.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/rekudenitasebesiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=youth+development+in+nigeria+pdfPDF 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_off0000d998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD998 10924 bytes
SHA-256: 4a0d1cfde90263308da94fadfd5285e72b2754753510fcd6f7759f80d8c0f840
font_01_sfnt_off0000f272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF272 17244 bytes
SHA-256: 44315fb32f3ee66599ba9d432da8a7d986f5cb538f2c3348bebb0fdfd087297a
font_02_sfnt_off00011f1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1