Malicious PDF — malware analysis report

Static analysis result for SHA-256 824e7e337a5e980f…

MALICIOUS

PDF

87.4 KB Created: 2021-08-30 18:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 81dbc88401b8ebfe980b67b981f2c96f SHA-1: 1d85c998db8cd982187e3a3233f129af018a4d3a SHA-256: 824e7e337a5e980f67328c3c492723ec5dac2527ca3523e1fb9a949535ac6832
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other disposable hosting domains. The embedded URLs suggest the primary goal is to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://philabc.ru/uplcv?utm_term=icd+10+code+for+essential+thrombocytosis PDF link annotation
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8e6b1385e---muxezeji.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0816c2b44---34845461311.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/kotera.pdfIn PDF document text
    • http://rfamilylucas.com/clients/73238/File/woredojokinorojejiji.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/tekegelenajagoxifetofa.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/b912db16f205c8ca81c912fb5782a151/fadixaxalilowuxok.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/90941805275.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/1f4a4b8fb92d958c3c753ef09ece2767/babimofumu.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/5nsv0jad5mi6q67sns7ahv1rt5/dumerajubululudokugegebir.pdfIn PDF document text
    • http://brlairport.com/images/file/vojitaxupobokekebem.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/04728ebd5c19fcdf47025b1c86525204/xilidaj.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b463c546145---40893209849.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080acf0e47af---fefofuxuwirabugowa.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/rebepabeseguwuvanidax.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/satikukemupuw.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/bovos.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202107310209075008.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/b085e9ba13fd57f0c6d3b5b4a742b2ed/79189535748.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/84135435815.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/bevomekozex.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_off0000ece6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F8 18496 bytes
SHA-256: 11c4507e923ceac6d159f65ace6c3bb6e03180474e5e30b38b519e42378e15cc
font_02_sfnt_off000135a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A2 11120 bytes
SHA-256: 31a853cd868e6c94d4695fdb0842bd0e843f67eda8ee39bef409e6ba00eb091c

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