Malicious PDF — malware analysis report

Static analysis result for SHA-256 a844152ae949103b…

MALICIOUS

PDF

71.8 KB Created: 2021-09-01 11:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1d6ef72b6027a8baab46aa7d35a24cf0 SHA-1: c8ba78da41c37b8e05015d869c8c7d66fb36d124 SHA-256: a844152ae949103b13b303198eba7a4a00cf0aa2f56acfdc4290650055f37137
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious link farm designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crysiq.ru/uplcv?utm_term=out+out+comedian PDF link annotation
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/ccc31f10aa66ac1d123c0cfa7c102aaa/85115289281.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/vozuxebemenuperum.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/161000132b7753---pazedilurotejade.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/dafaluradibigazamuf.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/q6j2epatrv9kfjh8fbhln53d23/21418296364.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9f0a5064a---17694186933.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/92860806215.pdfIn PDF document text
    • http://m4klynchburg.org/clients/3/34/34420611de4c9c7593cf5e5fe12de6df/File/49461158427.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901cda6ac04---tobinaseburiximeso.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d89cdca11---46157546572.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/nodafuraloz.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/80707164039.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a890c52f9a5---66675557585.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/pojedinojaz.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/56695507996.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/bixavojemugiwazajemakowa.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f086fd3f12---zuraluvikapelo.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/96167874664.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/menaserod.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/301412317487.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_off0000b8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E2 17208 bytes
SHA-256: c69eaf5ead4fc67814ec472af1681db9f340c5ae9b02464e1f0a4822cae9aa8e
font_02_sfnt_off0000fb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5C 10340 bytes
SHA-256: 2f6706ea9cb25fa3b8d8ca10cc5d680ea4590964c5ee5e789aafcfe9e1913a36

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