Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca445049de9c8dd0…

MALICIOUS

PDF

90.1 KB Created: 2021-06-27 19:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4a7fe93150664e99f6915e93c63cdab0 SHA-1: bccc86421a14757c1073a91f2902eb0a67955ff9 SHA-256: ca445049de9c8dd03589b8965d31f2bb1c7eae964f4a4f12ddd42564568ef4e5
204 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, directing users to compromised WordPress upload storage and other potentially malicious PDF files. The presence of a 'download button' lure and instructions for a password-protected archive further support a phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/vailfcvsbhsl83ilej41eo4ug5/90851717237.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/338ec90d085499851267b8d1ca2039ed/vizanajitibaped.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/f0e57ccec341c7c240a041a1c5db99e3/podipunazalabuja.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0ec9539dc---67978176957.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609304b23e645---jezed.pdf
    • https://al-farh-iq.com/upload/userfiles/file/77384868145.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/upae404993fhec3v9f763il2qk/22130176159.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608774a076907---21721837808.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1647b4d14---zogabulibisukuxoropi.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/sc7ftc5u6006d2nbjpfco2ftpl/kumirijinubajitajamiki.pdf
    • http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/tetevisopifegudo.pdf
    • http://sungsam.net/userData/board/file/fadegisefukemajaramulaxe.pdf
    • http://qca.ch/userfiles/file/67034715138.pdf
    • http://dansensvenner.dk/imagesfile///zutunefuropuvuvotikotojul.pdf
    • http://hrzservices.com/uploadfiles/file/57726645819.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/684e0908b420830825a8c0a733318879/bezoj.pdf
    • http://sicilalluminio.it/userfiles/files/farezifuximulubewonu.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/e020b1f6b5246731178a2a33314d8dcc/nefusizejuwinobi.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071669c1aa48---90059527691.pdf
    • http://coming-c.com/userfiles/file/68218774994.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b41d2c7c8ad---kezemanig.pdf
    • https://efnnma.org/files/file/ruwig.pdf
    • http://changecn.net/ckupload/files/zozixenesewujezegifimativ.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ed549e412---60779809982.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=itunes+64+bit+for+windows+10+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb5c.bin
1aa59f713ee612969620991b0ea931ff2e1c414df8d3f65d48269bd4125ccc67
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5C 11044 bytes
font_01_sfnt_off0001155b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1155B 16792 bytes
font_02_sfnt_off00012d6d.bin
99f6342d414bcd01813e69135a40fd75b2c78ec7db5bb0fff371cdf4a5b2f4ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6D 17456 bytes