Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f66ec10613161f9…

MALICIOUS

PDF

74.7 KB Created: 2021-09-05 00:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cafa91544c84586da7d51eaff554c98e SHA-1: 40268aef312a9b2bfcabb139055dfc5b0aba4cc3 SHA-256: 1f66ec10613161f9a451b4ebb439dc1ff7756b6fb350b7950dbbc99a9a4075ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution scheme, likely involving the exploitation of PDF vulnerabilities or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

Heuristics 6

  • 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.
  • 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://assushop.com/userfiles/assushop.com/file/fidezokodowine.pdf In PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/fobabanusotawexolomaza.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16073200db4ad3---46731529920.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/kuvamupibemojerepudo.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607541cc35d71---3024816188.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/bukuxozomiwixal.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/napaw.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610628213df27---beselef.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/599d7eb715dc76726cf61a19cc0e51e6/tajuzumebijuvabuz.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/3f4a8de66e2d03506c5eed2223515525/zevepipuze.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/bopugaruzif.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160bb451eac5a8---71866209938.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/1b07aaf5474b9d4fef0e4f2dbe1183a1/guwuruwis.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/nukosupugedaruga.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f799b34c752---76546415035.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b0cc6d85b---83932900972.pdfIn PDF document text
    • http://ifap.it/images/file/67860562332.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/67404306368.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/begevadazikebipefexiz.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/basokoxekaganonukopamuxad.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/60047453038.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/92438894324.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/652loklp3ft58b9vu124tnugvh/31770383324.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/f1nl5ck1cgu4iqfh2f7bvt42em/tikawe.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/joxajekoliz.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/judubiga.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210822053608.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=polarity+and+electronegativity+practice+worksheet+answersPDF 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_off0000c080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC080 11152 bytes
SHA-256: 21a015cf7397963f932dec78b5502a1cdef590cdcc6019a1e64da73b7f1c034c
font_01_sfnt_off0000da5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5E 15816 bytes
SHA-256: dae4a88c5ed0478ee138022a8eb6593311773748994ea4b17d1b96218d32e720
font_02_sfnt_off000102a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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