Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3fbb88aaf55d98c…

MALICIOUS

PDF

69.4 KB Created: 2021-09-30 17:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: dbb66d710a29ba970ff10da328c7e9c1 SHA-1: 47d87cd8285fe6b8212dbdfa2493910b968d34e5 SHA-256: f3fbb88aaf55d98c1396224b233d45b67c6a31a01f448cc530832d2eea556242
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS uploads, suggesting a link farm designed for SEO manipulation or phishing. The presence of a URL promising '10000 free v bucks' strongly indicates a scam or phishing lure. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing and scamming operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://accutindustry.com/Upload/files/20210925013009.pdf In PDF document text
    • https://ww150005.linebot.net/upfile/files/20210922165958.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/81478556540.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614451714f7da---xalerunugeluwamabeniz.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/zulumibibimodamiraduvir.pdfIn PDF document text
    • http://come2menorca.com/images/file/7365644447.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/28187872704.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210907_204754.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/kuzilika.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/14878472417.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613407087553a---73295399979.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/96553999364.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/lusug.pdfIn PDF document text
    • https://mhreng.com/userfiles/file/gemuzewunezivazinuwatine.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/febujuturaguza.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/suwitusifadomosutixiza.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/ak4krqhq9r3o8rcaf1gtfd5fgn/15294297099.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/jaxufareremomuresos.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd6253827b---jekaxuxemosekunegekotuso.pdfIn PDF document text
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109190545050388.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/10912325172.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/83271115053.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614fd4bb10c11---43853295773.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/suxizovoluxigegixu.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613a92a4863e7---83815511927.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=10000+free+v+bucksPDF 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_off0000b3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F3 14696 bytes
SHA-256: c26f8e6da5230fe048d751e95b1ef148849e418951648f5df21d619b90d73ea4
font_01_sfnt_off0000d8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D9 10180 bytes
SHA-256: a18043bf3eea4f5bf774de26f785ea8122658d389440ed79050bb65df206c105