Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9ced2bfd4ccdb3f…

MALICIOUS

PDF

69.4 KB Created: 2021-09-26 15:28:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1a743fda14e1fddc5d43111599b6c2ff SHA-1: 351c40418ca847cedc50e5a8bf811462d78a7574 SHA-256: a9ced2bfd4ccdb3f80ccda56a741eecbaa96ba59e7b5bb4a52924f1ae3a5507f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to external websites, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of multiple external links suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 https://infrive.ru/uplcv?utm_term=cupidabo+free+coins+hack PDF link annotation
    • http://newgrids.com/userfiles/file/watovukavixekiwuti.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/58115036682.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/33474400241.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/sanugevepemixuxapakefa.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/tufifo.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/68917034560.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/wokuteperonaloniguzifi.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/2r6r2pvqqddd6dshkfhvu8vdeghmhlqk/gifikut.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///88951858444.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16142f737c2ab6---16623237076.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/3477276542.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/36161832838.pdfIn PDF document text
    • https://portoggitter.no/content/files/userfiles/file///29225008430.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/dofevuwos.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/cghkhm44d3t3anufn7tsaddkn0/87071895273.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/jopinad.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/77864402549.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/xupalaboniz.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/20521376191.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/70601549597.pdfIn PDF document text
    • http://cl-pub.com/files/files/wamobaneno.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a188600cf2---tupuzixalewomemebotuson.pdfIn PDF document text
    • https://pierreseche.fr/userfiles/file/gojibaboxup.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109250618239741.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_off0000af1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC731 10936 bytes
SHA-256: 8ae93e9afe687b4a1353b189d2e448e7b610860668b6674ae979017916e83c31
font_02_sfnt_off0000e044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE044 15416 bytes
SHA-256: 329f911c23786dd59671b269cf3b11cabfb6fbf3db5b223e9f470b00f682e6c5