Malicious PDF — malware analysis report

Static analysis result for SHA-256 2560b009b6f4563c…

MALICIOUS

PDF

76.8 KB Created: 2021-09-04 16:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 657c444b2682ab96e15db2290f2aab9f SHA-1: 9c41e0520758bb985dd5865ca9b382f304c59852 SHA-256: 2560b009b6f4563ceb617ae8e54d8e83f170ac005e24e878f6e99d4ed75ed239
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF being a link farm, with many URLs hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and the presence of numerous external links strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://brenno-tojestto.pl/userfiles/file/64965845085.pdf In PDF document text
    • https://theptaynam.vn/upload/files/1305453767.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/19765286264.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/60419035205.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/53382225050.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/68050528758.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/3k8jtvrtpq0uo3b9m3ebp9raj4/bivezomedafi.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/pizovo.pdfIn PDF document text
    • http://darstin.com/userfiles/files/vukigubabebokevib.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160857889a218b---xewimisogegigebu.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/c7c7ca3209d3806b3729c3f28d3da902/34561871483.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/96637170735.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/levewegetuvilib.pdfIn PDF document text
    • http://lmyc.net/clients/875386/File/sojopotapinaletewokufo.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/0d676cbbaeb163181d2cdbb10e03b9a1/8829124042.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/zuvuwine.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/sujrv3vv28rdh0umv2peoqlh91/fujijijajatoriv.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/bofoxasagowenilired.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16091c8fe48094---fawadusizegetaxazezik.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/ct90v9pqasd0rc5tkf5f7kpu3j/dipomulutimiluvuvozip.pdfIn PDF document text
    • http://ofipapel.org//ckfinder/userfiles/files/49845142186.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/ketiguve.pdfIn PDF document text
    • http://vickerycarpet.com/uploads/images//files/41943789499.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/geginuzikegozelinevodidov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=consensus+assessments+initiative+questionnaire+v3.0.1+pdfPDF 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_off0000c11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC11D 18904 bytes
SHA-256: 9c3e0ad36ecafe3d57a922ee65863d2b8d3a0104909c41b47619c4eee61ed05a
font_01_sfnt_off0000f27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27C 11368 bytes
SHA-256: cac2c2f955259935b220f0bfb65ea04aa3a91c9c56acf037b2d9e357987b2f52
font_02_sfnt_off00010d26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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