Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bea2621fc637b79…

MALICIOUS

PDF

97.3 KB Created: 2021-08-01 01:45:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c0691c36192f609d39f1c06e92c41730 SHA-1: 403171aee912770ec2e9ddf0b036e237f728cbfd SHA-256: 5bea2621fc637b79235e7e01cd832e29dded0aaf17c9a8d761ac22a540c7a693
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely intended to lead users to phishing pages or download further malware. The presence of many distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://www.haztartasigepszakuzlet.hu/pics/file/modoxanolavod.pdf In PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/2504262192.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/57440608296.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/aa151b079574ca8e944d150eefccf1bb/90151884421.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2eac2334a---11860010386.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760445a1c37---xodowiwovoxugemezifezosu.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9379934b5---55112836712.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/linisoziwerod.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba238c19da---54012275061.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/4971603048.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/nenapabu.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///56654249197.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/39238535734.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/82584928585c1f19e7aeed8abbf1b61d/55560873756.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/68b30712d2d49273dfe8038097e1dc69/37080825942.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e25ea537b---81565756087.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/jozevamisofizoj.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3184950dba---65750172503.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160d04aadcb464---wikadipajipuzikemubi.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/6714d6bf37cbbf36040eeb2134046df8/41845078418.pdfIn PDF document text
    • https://luminex.pl/upload/file/11983750389.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/lafeteweximolu.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/66451958540.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/japalupiluw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+do+i+connect+my+bose+700+to+my+tvPDF 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_off0001140c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140C 18704 bytes
SHA-256: f1d6c366e3a48c8d336f74a090f5310e2068f17012b0d01337025527e2a111d1
font_01_sfnt_off000145ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015dc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DC2 10792 bytes
SHA-256: 74a69eaf5586ea1e5c338778f37684928e0352842c059cf3ee9b8afb7650c816

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