Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8da983b88953755…

MALICIOUS

PDF

70.2 KB Created: 2021-09-27 10:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ef8258c12841ca1f3eef740ef3875944 SHA-1: 724168fd51e2ba82c7c6c84d944542197195abcc SHA-256: b8da983b88953755ced7ff9ad11958c71de1327bb0b773b09f63e1030728d552
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting. Heuristics indicate this is a link farm designed to redirect users, with ClamAV and ML classifiers flagging it as malicious phishing content. The presence of multiple external links on potentially untrusted domains strongly suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://mayphotocopydogia.com/upload/files/67761231366.pdf In PDF document text
    • http://www.sandipmallick.com/fckimages/file/digikubulu.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/nenipirifisasamanuge.pdfIn PDF document text
    • http://kme-kme.cz/files/file/35535411634.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/nemuloded.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/1043283751.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/4864350328.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/piropipuropuw.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/4463649540.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/tafuxopoba.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/gamomometuto.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/24012375158.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/54097038755.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/levusifukewufulenavez.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/97193727710.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/89025391014.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/suzejofulukajelerip.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210909024811.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/bazazokavemoletalananitod.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141629e698a8---37460157749.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16150eee036f9a---nabepik.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16141e6488254b---62707854845.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec32ed2e60---13277158702.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=pes+2021+iso+file+download+for+ppssppPDF 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_off0000b33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB33B 14784 bytes
SHA-256: e233333c65c0dec046f56dbdd5797494443691e1a007dcca1bf474ecbf1fc5c6
font_01_sfnt_off0000d860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD860 10776 bytes
SHA-256: 448c8a1950c5673d6d87175ed1fa7dbd788ef602a268ead58010ad800733efdd
font_02_sfnt_off0000f16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1