Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b761d8fe53204e…

MALICIOUS

PDF

72.1 KB Created: 2021-07-07 19:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: de3c8fff23c2c8dd4d6affde7083c70d SHA-1: 4c65c486727a47a7930bf5d09c045747b71fd7bb SHA-256: a5b761d8fe53204e88e608a5b408d49583fde46b17c1615e4ccf3247f39f7c6f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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://krisoc.ru/uplcv?utm_term=jj+bar+and+grill PDF link annotation
    • http://bright-mineral.com/uploadfile/file/2021060218551414.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/b1k2r1b1qmt5bh8uh9gcafhov3/91927562569.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/inhlvp3d32k428ad120cps08dd/zarekekajelewobedibu.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2272e900e---zegopesif.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/totub.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/85278073102.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/683610a309b3e4a777ec2dcb8928c1b6/xazovixirazerupiresono.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210621063048_1994118114.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/wuwimesudapegukas.pdfIn PDF document text
    • http://drive4smilesquebec.ca/clients/f/f5/f58105ca183540932673f5bf18e62671/File/xafavobomejekegib.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609f37a9b159c---43284959929.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607202d579880---kewosute.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/13343369316.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607560dc8b09d---35795834088.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160db3c7d81013---bokulafokibofilopowatif.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8c31240ad---mogidofezufam.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/91504508888.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/049d6a1b9112bb91d27056dfb72b278b/51847417027.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf50eb25f6---vorujeloguzozi.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210702090025_wp5tst.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/sarugemizafapeb.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/38070565530.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cb957056c92---4222488175.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_off0000ba9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B5 10168 bytes
SHA-256: 83c9c850949ab2624215ba55539a5eff03e03bd2b2f13a22815102a7da1140db
font_02_sfnt_off0000e920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE920 16172 bytes
SHA-256: 3fab12527813ab2e972ff4a71bc98959815fd952c5cc7688b771290e3009dafa

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