Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c7db0aff34269e3…

MALICIOUS

PDF

73.2 KB Created: 2021-09-05 04:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c5c93826bfcd0cd892ef63d53d8d73b5 SHA-1: fdc89dea5dbd10405e6154d4234bf74da4cbdaef SHA-256: 8c7db0aff34269e3a78f44e74e5724a5734a69de80d7ad059ba1ce7235e7078d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many pointing to compromised CMS upload storage, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=pte+essay+format+pdf PDF link annotation
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/dnqdjlgs6mgapvgheudb6n7ml3/80270330073.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e02fa88a9a9---76458420051.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160843db388fc1---vefefisalowi.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/867b9627b8396afbdec1054cce6a845b/jaruxigiwojeturemekokoxa.pdfIn PDF document text
    • https://dm288.rs/slicice/file/samirijikedujawiwonifavuw.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/2600461560.pdfIn PDF document text
    • http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/zuxinas.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/19504799457.pdfIn PDF document text
    • http://prompol.com/media/file/lumuxedojajumipep.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609215fae9c69---gititerekotemapeworazuvaw.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c74900b40ef---62113648004.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/5aa86cf6ee832dcbb98204d18484b2ea/garofatoxibewimudomuf.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/gthmlp7m07rehc4pihqjfhm4f8/bemogib.pdfIn PDF document text
    • http://didula.com/img/file/jonefaziduwagemeliven.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210516085828113.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/45948446793.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/2c5426d1192769379fb5bd0e49923951/giselovavunugiwuwixa.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/22902780718.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/27100741455.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/t0jhpd94qn9n7rk6qev2sjm4j4/39466340903.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/felimuzugamuvidogi.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/mafuvupedupaposodijaze.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/motebaf.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD68 16532 bytes
SHA-256: 170a377c9b18c520d0bbfd38d8e365c7ea0e8b781c9522a08af0d006bd681285
font_01_sfnt_off0000e7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDD 10532 bytes
SHA-256: cd7370f03bffff7f3ae55c605fd6f9bb4b720f177910d008fd536c26dcce731f

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