Malicious PDF — malware analysis report

Static analysis result for SHA-256 98746156e05ba1b9…

MALICIOUS

PDF

86.5 KB Created: 2021-09-04 12:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cf88f49b2d338f3e1eb0c569a4ceb649 SHA-1: 2dbeedd3f294255f1cc167709299d5ac22470675 SHA-256: 98746156e05ba1b9ebca4390b9b3c1c9258f787423535035335cbba6f9da8c6c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to distribute malicious files. The presence of a download button lure further supports the malicious intent of tricking users into downloading harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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 http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160f5408fea619---nuked.pdf In PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9e6b0ab1f068e01dadace3126c7bed05/datosilalofodagudatow.pdfIn PDF document text
    • http://princeverma.in/uploads/files/xevejoma.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e80f9a709---gesuvolupumenok.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/jerelixaxelezosovejog.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c2974722a0e---xowexutijejafezepaja.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/68679180945.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/roveleraxamugubafada.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa95513ef0c---nidapi.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/37249965201.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/r5mm81r0jvm6fg2et5ku2p35hl/zogekogivakura.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/47912628497.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608193eec9f70---72763254557.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/wigamixe.pdfIn PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/42774098501.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/7c9f1973f6a812f11a73243ce3d4ace7/remadekalorefufeza.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/a2f584faa794ef703288a5339c5e2e59/lisaji.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-8-7/20210807104453492631.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/gidafinaf.pdfIn PDF document text
    • https://hanomanberjaya.com/contents//files/xevuniwufivifefawufobigo.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/ed827003ea50d7de70525c6bd4833dd1/65195636947.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9fd9e3123---78677721647.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/bb849eb8c2be7854a0fcb92099f87cc8/tedonowox.pdfIn PDF document text
    • http://dsagco.com/Upload/file/66110757901.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16074c8b082422---xesej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=convertir+archivo+pdf+a+word+gratis+y+rapidoPDF 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_off0000ebcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCC 11152 bytes
SHA-256: 416627a8d1b33c1601523271212fc4b33836efc70edaabf5bdc39c1a0d1a8778
font_01_sfnt_off000105b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B7 17704 bytes
SHA-256: af23ddb7a74b2a965f924f3a2bedaf666de6e0fb72a29401895ee43df66fe0c0
font_02_sfnt_off00013392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13392 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1