Malicious PDF — malware analysis report

Static analysis result for SHA-256 79dd1989e91a287d…

MALICIOUS

PDF

120.7 KB Created: 2021-09-02 14:17:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8fdd679273544140c3d351ccf22a0c4f SHA-1: 25b098fc9f84087c865d73c243493b0a760851a1 SHA-256: 79dd1989e91a287d40788cc873e30e7d87331360394f30dcceed64cc63662208
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://versobrokers.eu/userfiles/files/15574359372.pdf In PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1628920261.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc572233df---davabuxikimid.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/svdaos6lg4bjpllde44fpn97s2/44413223283.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/9ef17fd9389054f281a48ecc066154df/89398058917.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/a6763f1e066688c815dc7c0b370ba758/riweg.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/bujilepuger.pdfIn PDF document text
    • https://zold-kommando.hu/files/37401899101.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/ef31d59ec495918c651e643c0ce83a63/wogudupazidug.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac66a6a520---bapedirazafovibugisefo.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af91a8e08d---vizugetesipiwalowemivumo.pdfIn PDF document text
    • https://tanasiri.com/piceditor/file/51616127068.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bda06beb090---84008338091.pdfIn PDF document text
    • https://andrejc.si/files/file/vamapek.pdfIn PDF document text
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/zovexazozifijatenikegon.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/a33952b90ea72ae7257d3ed7d4ae2fc8/21982215782.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/40475895525.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/monexovutawemuto.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/vowojawo.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/7ec070e416b2229cc608d832b37874cc/94477613815.pdfIn PDF document text
    • http://biosite.ru/images/news/file/33763850537.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/wamagulibobut.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/23472048259.pdfIn PDF document text
    • http://pusulacampeyzaj.com/images/media/files/dunefevupuvenoxegolutos.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/61807802331.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=operating+system+principles+pdf+downloadPDF 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_off00017165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17165 18640 bytes
SHA-256: 4c73404eaea613ced2d209eb4dd6d99b83bf976e4c6a92a459ad8a2af91f5b55
font_01_sfnt_off0001a27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A27F 11188 bytes
SHA-256: 34b341cbbd8bb6e3cf85ed1beaa06e18d8f796d1a8ea0762ea49419330a98419
font_02_sfnt_off0001bc90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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