Malicious PDF — malware analysis report

Static analysis result for SHA-256 77ff9ff582cbaccb…

MALICIOUS

PDF

74.3 KB Created: 2021-09-16 02:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 249c84b91d1d4aaa475bcb7af5c36520 SHA-1: d0fdc848dc60289df66b4200001386e2b4732096 SHA-256: 77ff9ff582cbaccbafe9c8a921e9308eb51db15391c14736b281adf265c32737
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of a 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the nature of the URLs and the heuristics point towards an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://drafthe.ru/uplcv?utm_term=download+pokemon+apk+for+android PDF link annotation
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/famusolifotekejosevamoke.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/jenopezupu.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/72944827719.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/vaguxanazofijotiwonavape.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/zakugesemabanol.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/26728083599.pdfIn PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/32683451461.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/83808814274.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/40626875728.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9f2157308---jolerupoxuguv.pdfIn PDF document text
    • http://netflor.pl/upload/File/jolevewujazereza.pdfIn PDF document text
    • http://yogasol.cz/ckfinder/userfiles/files/nikotodozegafazazi.pdfIn PDF document text
    • http://cartopack.com/Images/file/fodevonuremafiju.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7161177a0---gerupupul.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/41553474045.pdfIn PDF document text
    • http://spharma.ua/files/file/kesemodovebitamisaz.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/50328490.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec07582ac0---39817130219.pdfIn PDF document text
    • http://prmakeup.com/Image/files/mijojidokixeros.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/sutamikemajajejavi.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/43989684998.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/57326885367.pdfIn PDF document text
    • http://aquatherm-graz.at/files/41407113205.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_off0000bd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD6E 17964 bytes
SHA-256: 3ba53a797ccf779380379eb4b61f59288ccc6b58d6e183c6ff3e40fa1f3150b7
font_01_sfnt_off0000ebab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAB 10572 bytes
SHA-256: f5dfa2df5d281ca13382d6d4d80519f3666a20ebe6f7d4d91ed5d69857d8d11a
font_02_sfnt_off000103ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1