Malicious PDF — malware analysis report

Static analysis result for SHA-256 456c7da3f851c015…

MALICIOUS

PDF

75.9 KB Created: 2021-08-30 09:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: beffee19adbb1182bd4e28fe436f70f0 SHA-1: f115fb1bb75c111aac9676d1d22123af1776b79a SHA-256: 456c7da3f851c015e030ce1bfc8d3dfba715ef69be72425b949fd9c89dcbe5e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, many hosted on compromised or disposable domains. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://chcial.ru/uplcv?utm_term=no+pdf+option+in+word PDF link annotation
    • http://shuswapladystriders.ca/userfiles/file/logurepapogodikipukiwofoj.pdfIn PDF document text
    • https://t2sc.me/userfiles/megodalizuxu.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/8645186363.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/gejibokix.pdfIn PDF document text
    • http://smith-williamssisters.com/clients/d/dd/dd6cbc7353a6ef31c13ccaa63ab862ac/File/15001756242.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e71ce223f---moraxodano.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/01b378f1178d092f691e1f2a7fc6f774/76534436069.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ec3151650---kavogitirifipumad.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/fawometudasawezumo.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/debutogoja.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/rifupawewasa.pdfIn PDF document text
    • http://humanlitech.com/files/files/3818640496.pdfIn PDF document text
    • http://kag.fr/userfiles/file/niwagiditovidipurasupis.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161277e43c6c91---95137168366.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607058258ae69---66889169280.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/zalebasijedafabavowafop.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/tbfaac14hj3crbsjadpbdtsddf/79479624150.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/37490258670.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/51783636103.pdfIn PDF document text
    • http://thecoferfamily.com/clients/7/78/7892d776c92a08c80f86ebc6236678d2/File/putevokuxuzepexelolo.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/3f5i16upkbnm0qm22vc4v488a1/rozadamojuju.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210704_124323.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/votivukefetapozawon.pdfIn PDF document text
    • https://eviinstall.com/userfiles/files/dodarum.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/4560505433.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/70508635688.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_off0000c6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6AA 17276 bytes
SHA-256: 5f8cc708759218de8b96005c2923af96385e94165445758d9a3502a8e38b9dc3
font_01_sfnt_off0000f31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31B 10048 bytes
SHA-256: c4820a4f5c0c7230c3681112a37df77077ebb569d4070633d24d944ba28d961a
font_02_sfnt_off00010988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10988 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1