Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c779cf28a60cf6f…

MALICIOUS

PDF

74.4 KB Created: 2021-09-17 20:17:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 207b0866a477a594ebdd709af8cc40d2 SHA-1: 04db561895e299ec36364778a7d40a03adb79408 SHA-256: 6c779cf28a60cf6fea2d960d034e4ee5fd90ce03377aab771c94d693a2eefc97
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload is intended. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://thegioichuyendong.info/app/webroot/upload/files/69090195863.pdf In PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/e5hvgc292eub8q1dgng55coih3/20678090435.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/mewesuzexafuduwapofafo.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/723788110.pdfIn PDF document text
    • http://hitechdentalhouston.com/uploads/files/36006398816.pdfIn PDF document text
    • https://digireg.nu/upload/65689185189.pdfIn PDF document text
    • http://skupka54.ru/upload/m/81889908267.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/64855222129.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/45ded616e877218a7f295535b6096795/nevesitekalilo.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/guxunaporaramopubapajoken.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/882925244.pdfIn PDF document text
    • http://ailizia.com/userfiles/59610982477.pdfIn PDF document text
    • https://motecx.com/images/file/nosetewib.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/59066315615.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/73723533097.pdfIn PDF document text
    • https://interno-kazan.ru/upload/files/donej.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/80365763428.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140721f1341a---40604541971.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/77206668411.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/zusuxuzasus.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/denamavajadatuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=adobe+lightroom+modded+apkPDF link annotation
    • 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_off0000c0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90E 16716 bytes
SHA-256: 70efb549a2744dfbd502100cc7a04b2a91482cd0966a7eb99c2ccd8a86f5ee37
font_02_sfnt_off00010434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10434 10780 bytes
SHA-256: 8b74eee3f7486806dbfe717139a8a0a6f68c09b0f75e8100dae87141490af8db