Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfa16272e2e8b0b1…

MALICIOUS

PDF

69.7 KB Created: 2021-09-25 00:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6e3973f3a3be920c958c071abaf962d8 SHA-1: abf40a7fbdc75b91f6594065a3efc606b9ac263c SHA-256: cfa16272e2e8b0b186dd7a8ac47e6a20a3f882298c120fef8c817891ada80197
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://irlanc.ru/uplcv?utm_term=hamro+keyboard+app+download PDF link annotation
    • https://amatnieks.com/pictures/image/37900329624.pdfIn PDF document text
    • http://hawaii-resort.info/images/blog/file/nekalabikini.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/mudoruseligejelenuber.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/18890802875.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/14668690270.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/jebadoxigikivimovoj.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/zazabumoner.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/46859403433.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/zexizu.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/85364125135.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161481573dbe9e---nupakaketed.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/vajilutis.pdfIn PDF document text
    • https://megatex.ua/images/uploads/file/93262971309.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/butaforotidivofabi.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/dc537529b427106c272a082008a7e83c/6046520132.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/lidupajomisitezix.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1613c64891b7c8---patevetabilumob.pdfIn PDF document text
    • https://sealskinz.ru/files/file/pimosejetodoza.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/jejijufuxozoxedotugizupep.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/jutuk.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/sobemomizutonumuzegoruva.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/ragaref.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_off0000b09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB09E 16024 bytes
SHA-256: d7f231315c629ab71998af694af8aaf55e88fcfb5e717d85bc5b93aca698c039
font_01_sfnt_off0000d902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD902 10620 bytes
SHA-256: d7e6fd85ed9ae6d9cb8bdff16796e834369cc66d8b554b0fcecbeb2202fbcde9
font_02_sfnt_off0000f105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF105 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1