Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eb687d1713299d0…

MALICIOUS

PDF

76.6 KB Created: 2021-09-13 22:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4ffabcbba73b0bc3b2d5e52f8138d279 SHA-1: 816b43c7ed81668373279e89ee96b98ddcc753a4 SHA-256: 7eb687d1713299d07209f4d6f80ac7f898f5d1233f448349cd5e1ac6425dc113
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF that utilizes link farms on compromised WordPress sites and other disposable hosting to redirect users to malicious PDF files. The presence of a 'download button' heuristic further supports a social engineering lure. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://namhunglogistic.vn/site/files/purejujitofezurovis.pdf In PDF document text
    • http://sushinamu.com/uploads/files/razexodirosemoseborepuges.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/tojoxavaxetusubugulevij.pdfIn PDF document text
    • http://viettruss.com/upload/file/36942358618.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/jonipebifavaw.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/62138593448.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/todexigekemutirazepinuxef.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/40578818701.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/sadokitutafe.pdfIn PDF document text
    • http://change4best.ru/upload/file/87035451251.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/23052345885.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138df378c493---narijufomemixuxu.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f885ee318---koguzesarapofoka.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f48d1cbc39---wuluwuloravudewukana.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/37049228279.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/20567710932.pdfIn PDF document text
    • http://licausi.it/userfiles/files/vagasirefimu.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/11651564609.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/jixibugodofinakasejaromez.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/pidavesebivigedevevat.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/020803323541.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/vifejopipase.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/73200643980.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/66202814113.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613323041c03c---neginep.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/sinumajumebetisinixidumif.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/44614101831.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=emular+windows+en+androidPDF 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_off0000c9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BD 16668 bytes
SHA-256: e721cd575d1cd515659bdd52ce937108a60630aa62d4013533029a38fa2d73dd
font_01_sfnt_off0000f4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C0 10480 bytes
SHA-256: d3836dafdfc11aedbcfaa39a1add74ac516b74e7f401a7e4239dd2a093d026cc
font_02_sfnt_off00010c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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