Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fed3fada623aeb5…

MALICIOUS

PDF

119.7 KB Created: 2021-07-14 08:26:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 934db72266e10136aa57b951db9de665 SHA-1: 7591185d8f01a0dd0b993df5487c2bc1f2a6549f SHA-256: 1fed3fada623aeb56b658b2bcb644d7cec3287edcf02789aa7c55c616fc632dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to exploit users via malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9691

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 https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/jvcsfofsr0bepgiu4hbc6i95k4/pedizekibojedisem.pdf In PDF document text
    • https://aashianarealty.com/file/nefebamapisidediziwoxo.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b32686c88d0---90978619624.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/rhcvs5ouo8818vrv6mtoilekk6/piguxemigegibojapetade.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/95636e637c65848db92205141682e42a/xitovegifova.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/51990059275.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608825dda6d78---morikujidarajikelif.pdfIn PDF document text
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/wumijubufige.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/92084958381.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/birodonejawow.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52302709140.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbdcda3887---nabibivababotu.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079508ee006e---96955152131.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b115d4481ac---14093144094.pdfIn PDF document text
    • https://studiorampinelli.com/file/tegopefepelakasajo.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/xedejariduwurekalowawaza.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/jibufapaxew.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e196592ca---sarivufarajebowe.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/betilujemurak.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/4acb51ce2d241d8cd40389b95f917d4d/75432979308.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/be2e47447ae7f1e5918a65a8e4285ec2/nokirolod.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160d3e04261c95---12065153998.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/92626402988.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=the+inside+outPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001b62f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1B62F 17508 bytes
SHA-256: c323b66d1980b259a7fbee0801e8230f61917b51c84cdca6295629c86ee75d08
font_00_sfnt_off00013672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13672 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014e84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E84 26212 bytes
SHA-256: 9ed6a169fee8aa3da98f68fb9235cf6280f0f0a1f09bf61556d80140a87df846
font_02_sfnt_off00018d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D66 10100 bytes
SHA-256: c8570d6f1b0df80c79dc01d1bc3465b0153c35ce577a82e0ebb71a45210b2bc9
font_03_sfnt_off0001a3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3D9 5140 bytes
SHA-256: 364a8d268c99f3e5769619f21c04deb912d09b884375d8c60a77533247ff8485

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