Malicious PDF — malware analysis report

Static analysis result for SHA-256 a06dd43e3555de81…

MALICIOUS

PDF

254.9 KB Created: 2021-07-29 17:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b041d14985f1d70cc500a212038f06c0 SHA-1: 73c000e9c3c2721e417e6059bec9e7e9811c4f66 SHA-256: a06dd43e3555de811356625c2f97bd3ecf6ee02c2a81c90e627288c28124f8a8
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or malware distribution attempt. It contains a link farm pointing to compromised WordPress upload storage, likely serving as a lure for users to download further malicious content. The presence of embedded URLs and the nature of the heuristics suggest an attempt to trick users into downloading a payload, potentially via a phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7533

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c66c9e74a3b---mosidutoxenun.pdf In PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c10bfe2c1ff---93243275156.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16070a47699b32---vanupalulinibawarijuroj.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095dfbc6d411---wagilanudibimusukizefi.pdfIn PDF document text
    • http://muszempilla.com/files/file/54639585992.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/sivemuru.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/lv8kuk1hid4civr8ld1lr88iqt/niraranusuladuwo.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160de5bbb7c4c5---bazitiw.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/4a2af3621ab82642e32fd11a4ffd6b6f/nukunakedopevef.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817f9b8a6fd---43721531717.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/xenubo.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/40199102053.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160848659f40d0---fukijovoripikexetefon.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/zasabepagegeletuvuba.pdfIn PDF document text
    • https://chp-travel.ir/data/file/roletafovukolu.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/timamivuzilikinoxolujivu.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/46820059374.pdfIn PDF document text
    • https://immobilgold.com/file/vopedoliguxevomodasivi.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/37103617241.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/d05138d6fbd5a6a991d7fc8be8f3d9e0/63403177713.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/sazopenoguwovimaz.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/rokefanese.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/radanijes.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7bd9cddd9---14815076259.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081359d4ceb1---sarozefetewiwofoxokikuzu.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/1uqui2b17pdeighkjj11ju3af2/rubusanipisitinosawa.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/68307361247.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=gramatica+basica+del+espa%C3%B1ol+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00037784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x37784 1816 bytes
SHA-256: 6a3aa8cefd0f800abc8136e45ebda0e6fb5dbe48565547861702ad806fa2ac83
font_01_sfnt_off00037ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x37FFC 11064 bytes
SHA-256: 9d23b79bf9af3222150a12bb59ff98996cc120be11cc3b0cc11be5b8051af0a4
font_02_sfnt_off0003998b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3998B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0003b19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3B19D 21820 bytes
SHA-256: 1be4bc7c54c0550a347754503ed0aa0e7214e16058f35c099296b403aecdba9c