Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc9fefe6af01e994…

MALICIOUS

PDF

93.8 KB Created: 2021-06-29 12:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8903a0b83e4bfdc8dd7eeb9ea888f61f SHA-1: d683f6f2e4f624934c5bf7af0ca3cd1e93453e24 SHA-256: cc9fefe6af01e9943831915299eedf186f9d66180726b809971921b16408bfd3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://nomylo.ru/uplcv?utm_term=hogwarts+reads+harry+potter+crossover+fanfiction PDF link annotation
    • https://hotnews.md/upload/userfiles/files/22845587685.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/c83ba6e3ab812f651f5027b82140cacf/ximabirir.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606eda47a7552---76716138524.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca3a66d7f7---depisibutulabasunudobuki.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-2/20210502090349909985.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a426e77e6bc---39744754778.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/panibesomolajuwazewiri.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/52327353541.pdfIn PDF document text
    • https://humicdp.com/uploads/2021-06-29/images/files/3527575809.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/mcnqr2r5rnu7ragd0hi8ouc830/vugogix.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/23880211475.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/xevaxilu.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f655654424---lopipomo.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085ee28a9391---fukinogewopagosonitola.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d7abd9f53---lazujawolusaxokusan.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/10972791413.pdfIn PDF document text
    • http://manninareunion2012.com/clients/0/03/03b30fdf9aaeeba733afadbef254ff7b/File/51779190062.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/84111809092.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/39332192442.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/6985015381.pdfIn PDF document text
    • http://mayfamilycircle.com/clients/5/53/53cd9f4101e72b768929e5daf979c2da/File/wewonogitirajidolab.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210607112759186.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///kufesetobag.pdfIn PDF document text
    • http://446888.top/userfiles/file/mudifuwalosifijuf.pdfIn PDF document text
    • 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_off00010a5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5D 17392 bytes
SHA-256: e47d1886c3a07d1a6a87e3a81e1d12f9e7cd6e7a3ec6ccf2aaa6ef9ba4d27b40
font_01_sfnt_off0001379a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1379A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FB1 11112 bytes
SHA-256: 93942a59f50e2ad503a5bd6797833afe667140b4a078db7f2fa9d4acc87b6d17