Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceabcaa346ea7e52…

MALICIOUS

PDF

81.9 KB Created: 2021-09-01 01:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e2439322740d5828f51baa989df76241 SHA-1: 78b94985f1d4cf29b4b64d7ae971ca9cd14707d0 SHA-256: ceabcaa346ea7e52a6fcb3017bcb3c253ff0a8138fca37984ec03016596e89b4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farms strongly suggests an attempt to lead the user to a malicious site, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crewmak.ru/uplcv?utm_term=solved+problems+in+control+systems+by+jairath+pdf PDF link annotation
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f48d07451c---kabefukejigilemexulopi.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/abu59tlruuk56lbn0ttp523hd1/5058169903.pdfIn PDF document text
    • http://s-box.biz/upload/datoteke/wuwelo.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/vakabeb.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/0cbf16c99659e5fffa44128e09589c0b/jixosenabepoj.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/lurenabirelesuvilunaras.pdfIn PDF document text
    • https://wineuniverse.us/userfiles/file/70149266290.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/taxodomegiwe.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/15697518357.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/gotijuvematibo.pdfIn PDF document text
    • http://megalaserasia.com/upload///97519444056.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6ab06e14d---86546289714.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/wikuninimutogoxi.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/h3dc2m8fd7iclo6r26vbsdv7lk/xubuw.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/5321640498.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9ecb6b473---sofenunebadogatok.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/ruwonojakatidaloku.pdfIn PDF document text
    • http://wych123.com/upload/files/mosopinenivolufi.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/129811a6764d72da37df36e5b267db80/wosozowat.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1967e0e7eb---xefedo.pdfIn PDF document text
    • https://adikkeempat.com/contents//files/jonuzivulez.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/gafexuses.pdfIn PDF document text
    • https://anfauglir.com/images/file/68344146036.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_off0000d8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C5 17552 bytes
SHA-256: b3f4c07cb80ebfa79f8b379af780d44339e636c4ec475eb270f2452505f74c7b
font_01_sfnt_off00010681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10681 11412 bytes
SHA-256: 35720fab349be0ec8c39762348fb6b7c8c10792b0adf088bfe8f17831fac1d83
font_02_sfnt_off000120f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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