Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c337a52bc54d12b…

MALICIOUS

PDF

78.2 KB Created: 2021-08-01 06:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 09f0fbfdc62d93e88332d73bd0ece412 SHA-1: d79b254d22a610d67ff6238aec82fc609d4e1d6b SHA-256: 8c337a52bc54d12b6dc0117e0e9686524e0ccb04bec95d5ee3b867e71c4c4303
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF sample was flagged by multiple heuristics as malicious, including a critical ClamAV detection and a high ML score. It contains numerous external links, many pointing to compromised CMS upload storage or acting as a link farm on disposable hosting. The primary attack pattern appears to be directing users to external URLs, which likely host phishing content or further malware. No scripts were extracted, but the PDF structure and link farm behavior strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crewmak.ru/uplcv?utm_term=prepare+an+absorption+costing+income+statement+for+the+quarter+ending+march+31 PDF link annotation
    • https://grandhotelbulgaria.com/userfiles/file/46798491282.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/vodapojirijuborewodededas.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/jpjbspuihhosp1m97senso89ku/94406028224.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/9duhj8il6n6pfvjmuosun8nsjf/zobodaxabirusorobiwib.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/mubaxizufozote.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/6d152b428f2aaae7cfc1992664910604/43062829389.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160887d552aa29---98326788986.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/84183778600.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160804fb35c294---wofugekozijobirus.pdfIn PDF document text
    • http://taitung-house.com/CKEdit/upload/files/27018757793.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adb58c15f91---madinopufamufup.pdfIn PDF document text
    • https://hgb.se/filer/file/raxomamezopiriduwuxod.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b65e72bd5a6---bezupenebibofogumadok.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/lifujeloxuduvu.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2b1982ac30---sepazotupufegexinamu.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac007221cb9---duxevepomapipawubefig.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/fapajaramazuzanozomude.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/daregasuzateturuzi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d88fab1436---sogifaxa.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/daa8f6571704a15696431d2e3f570d56/425406867.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b77af75db9e---84573740161.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/28327352189.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/67835606415.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/limazeg.pdfIn PDF document text
    • http://veterani-pushkino.ru/userfiles/files/24467565916.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_off0000c64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC64F 11632 bytes
SHA-256: 8e5e6e5c87e6171129f766f14472d7e2910e1bd139fbf4336b0935a22d1ccafd
font_01_sfnt_off0000e116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE116 19208 bytes
SHA-256: db29ba8965018e166db84a85791b8e8b9d7f62d22396b4a9ec9513f675bebd20
font_02_sfnt_off00011200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11200 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.