Malicious PDF — malware analysis report

Static analysis result for SHA-256 77af0b4f68da3116…

MALICIOUS

PDF

89.7 KB Created: 2021-09-06 01:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 59cfd76ae39a686f8a4fb9a1e4808931 SHA-1: 9de331a160c95d2ce58880ddf259ceb45d0b72c4 SHA-256: 77af0b4f68da31163b3656ee9409500e496be33558f44941c8310df4abd67db2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • 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.
  • 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://hifitness.hu/userfiles/file/pupevuxusatadaga.pdf In PDF document text
    • https://xehowo24h.com/images/ckeditor/files/48057570549.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/668f9e761b588f265739bbadf7d3433e/jejixibonifomebositatomo.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/106e3472618c3d7623689109b638a26e/dowuxuletokagavosus.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/xokax.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/23745361663.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e130c40d7---midoluzodefudumuzowilegi.pdfIn PDF document text
    • https://ptogel2.com/contents//files/29422910014.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/59786789077.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1610903ee45f6d---sigubunivozexinateki.pdfIn PDF document text
    • http://aweibel.com/Photo/file/lapoledevijebivaloteladiz.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/zubugitavawesezufug.pdfIn PDF document text
    • https://activepymes.com/pub/file/34860286273.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c7840dd25---sigemepubar.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/444a0113198190ccd7130d4ab6c35db4/befigavo.pdfIn PDF document text
    • https://tisuputih.com/contents//files/7842599007.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/wesivotixun.pdfIn PDF document text
    • http://jrjohnsonfamilyreunion.com/clients/0/09/090f04f22b165063c0e57546eb93b169/File/bunosikomozuvabamefapes.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/msftv6i66kn3a2tabm868qev61/gefejirubewabede.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/turopabibinufimexawovi.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/52350312853.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613424e580998---mumovefunebiwubuvuwij.pdfIn PDF document text
    • https://andrejc.si/files/file/wuxokupi.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/64876875488.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/b0sd8r6cijl7h6l0tvsj5ko492/kuxikovejapolofoli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=atp+challenger+calendar+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_off0000f3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F7 20452 bytes
SHA-256: c2aaeb91f6b99f84bcf376f960baad8f3569576f54180c102c16c152b24470da
font_01_sfnt_off000129c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000141d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141D8 10500 bytes
SHA-256: a7bda08f80926537fe949f31789e55fb20c86e223267490a073b55c875bb299e

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