Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc966f605a099e0d…

MALICIOUS

PDF

79.6 KB Created: 2021-10-10 13:25:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 193f2b34a32d4d5996344152aa9c8a10 SHA-1: 911ea74cd7c14e77dc2050766ad014282ae98ed6 SHA-256: cc966f605a099e0dc2db094e71c7bca01a7aee176c9809f1ef1ea9c1b5a10d06
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to various websites, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to potentially malicious content or phishing sites, aligning with the characteristics of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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=pictures+to+pdf+online PDF link annotation
    • http://yugang360.com/upload_fck/file/2021-9-1/20210901165348396920.pdfIn PDF document text
    • http://tsuiteru66.com/userfiles/file/95856130250.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/00k5ot9f9o0gh7sfe5s54b3qr6/zolowofuwezuriku.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/46772397596.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161426e061c741---2808360176.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/kowawugiwosutovolexipawax.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/lupugej.pdfIn PDF document text
    • https://jjpremiers.com/files/zuluxabizoduxijelat.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/zakugejadigukefemenavu.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/38000552660.pdfIn PDF document text
    • https://ckmandarin.com/uploads/rogoradonufe.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155dd7b9deea---pemabik.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/davarizoki.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/28330960999.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210919230024.pdfIn PDF document text
    • https://mitrasuksesku.com/userfiles/file/97021606861.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/wesonisetijukori.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090923383480.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/23999134950.pdfIn PDF document text
    • http://llux.vn/uploads/files/mamowijedum.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/34768802921.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/simugofi.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/ginapisivimenanadejameten.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/nemirupuzepavabifemurilap.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e2b22351b3---jotixomakuw.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_off0000d56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56B 16692 bytes
SHA-256: a28b183a00c0d03b4e967b4d846a072e390e318aa0e212d7d8efb3f68c32566b
font_01_sfnt_off000100b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B2 10552 bytes
SHA-256: 918026a60aa01a168aee89e866f33d48621d8e699e7d380ec0cc1cf03f2875e5
font_02_sfnt_off000118e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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