Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb4653ecbf888e6…

MALICIOUS

PDF

82.5 KB Created: 2021-09-14 10:16:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ef1943e71184443bf84b64bbbba69ce5 SHA-1: 2ecbfeefd2cc3175189562048539311390c37069 SHA-256: ecb4653ecbf888e62aceb0086a6af8a879720deac8ef904ab748ab22c3497b05
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs that function as a link farm, directing users to external websites. Several of these URLs point to compromised Content Management System (CMS) upload directories, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://ketchas.ru/uplcv?utm_term=kodi+cast+chromecast PDF link annotation
    • https://o2opr.co/userfiles/files/rojunuz.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/83757475799.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0e08c426c---65369545636.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/93475717389.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/2332398767.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/kebiwibegarotisadad.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/votegan.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/a5a84ca773805d1209ebbdce52926a6e/11403143302.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/93200078984.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/73501645712.pdfIn PDF document text
    • http://alltechsro.cz/files/9658267849.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/63347050301.pdfIn PDF document text
    • http://gyn-ordi.at/myPix/file/55903303038.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86196260067.pdfIn PDF document text
    • http://lobi.md/userfiles/file/81411290729.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161318d63822b1---94788625613.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/1961856648.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/duzekerorubesusivir.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/tawaren.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/bebeseninurubuxozapa.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/28855617193.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/wugufunitoja.pdfIn PDF document text
    • http://wdnederland.nl/file/sedopexid.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/70cfc722cbc6226423527c4a90c96bb8/jeravinewatefozo.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/moxopiri.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/84180955168.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_off0000de6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6E 17672 bytes
SHA-256: 6470cfd28ad49f6e29bf45ab3655ebf6805bd50f9b646f52c8dbefee1fc48106
font_01_sfnt_off00010c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C57 10476 bytes
SHA-256: 584a69b2d94e68c5c4521ad37d005b5a654fbe23e401067ea23d2c1c7ebc54a9
font_02_sfnt_off0001242f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1