Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0cf5fa0556ccd9a…

MALICIOUS

PDF

81.5 KB Created: 2021-09-04 07:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 527beb54037e1b42dd993a7e384915d5 SHA-1: 6954ff7af3683c3afd702afb55dbb95bdc6e5e4a SHA-256: b0cf5fa0556ccd9a5ac7b4c894096f7771cbf38525b50d51c943d47f901f006e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites and disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URI links and compromised CMS upload links supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=husqvarna+353+chainsaw+parts+manual PDF link annotation
    • http://ytbozhuo.com/upload/file/161546366941.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/f1b3af05b6607b2c2f4656eb5873427c/miziwitexakumorop.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/ruzitukememuj.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/bnehipfa30ljmmcn16tok32seh/gevewikajusekuwasukav.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b609f1736f0---piminivepav.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/62858211490.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/2de9707eec6b8afd7ed951580832b0c9/verekuxi.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/15948205765.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/82h6av586brblda4f77vps67f7/73321974089.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/dolabikisaz.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/xatuvijaxividilatije.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/dikowibemexi.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/57902875500.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85c8d8a87a---69514932998.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/048e5c99725edf45bd57b524a6878dcf/16774984095.pdfIn PDF document text
    • http://liderzy.natura2000.pl/imgturysta/files/78917559524.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/g8apqjku6vk5kmn7airo4rve5c/49415556062.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/nuzizokugilarojodamiro.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/34495284659.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/5920326435.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/88898861101.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/dupovorebokisavilaguti.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/1b892b0e8b69c77b4b90014a94ec7184/bejiborewixaxibanitafaw.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_off0000d65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6E 18908 bytes
SHA-256: b9f6bf8b5f1169a4db0d11817648ade189c52e54365a2cbf4b4d0d23e68b02a5
font_02_sfnt_off00011e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9F 11084 bytes
SHA-256: d46f750c281f242a46ad1f987ce3c24385560a1d3da75c5da2a225f65434e297

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