Malicious PDF — malware analysis report

Static analysis result for SHA-256 78217c455cbd63d9…

MALICIOUS

PDF

90.2 KB Created: 2021-09-15 14:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 62c5a2051cb6e694bf7e19a70db56da9 SHA-1: 23731a65a3897820a3c65a5ca20336ae63ab2bad SHA-256: 78217c455cbd63d97245187e77d682ea5ed78aae26efd8477df8d9bb9b9cbb23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to potentially compromised WordPress sites or disposable hosting, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://ketex.com/trcgp/ckfinder/userfiles/files/pigurod.pdf In PDF document text
    • http://alda.pl/ckfinder/userfiles/files/41391517219.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/56745125640.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/tadibosusifenotukexinoduj.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326205e872f---defotulenusuvizebaw.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/73441769491.pdfIn PDF document text
    • http://ping-property.com/user_img/files/48165266769.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/nasimurujegenezuponof.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/26985049904.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/54510942452.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/e38d66de484aed40c30772977f35e42a/69994028446.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/rebavosamubupidadin.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/54872163646.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/tozosix.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/lozalosofazomovavilokixej.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/80493398754.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/savezuwuropejaxen.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/pekamunaxe.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/45145804078.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/32475899631.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/47840470715.pdfIn PDF document text
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/91133758530.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210906022256.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/6e141bc6fed1df17a4ed10ac041a7ba9/rizuwesutoveponiradunilul.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/jusubuwukudabomilem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=do+you+need+to+play+witcher+2+before+3PDF 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_off0000f952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF952 11284 bytes
SHA-256: d51b015bb61c70e03bc16c5f53db74e7a00e6f08a3372fcf6b4eefed2f392c73
font_01_sfnt_off000113a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A3 18100 bytes
SHA-256: 8092edcda4efbd8e20aade3159463d4abac57f0b19819eae22f6b6fbb44e76bf
font_02_sfnt_off000142f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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