Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c65aee33a2dd58b…

MALICIOUS

PDF

85.3 KB Created: 2021-09-19 12:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f819487badef985ae7d506ece7836eca SHA-1: e97061301602b8edee11246e62faf99db393530b SHA-256: 5c65aee33a2dd58b1ed24a5240b2f0b4a17e6d2c0949af91ce905c8b240426c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on various domains, some of which appear to be compromised CMS uploads. The primary purpose seems to be redirecting users to potentially malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://psychologyforeverybody.com/ckfinder/userfiles/files/fobuzomodatilamub.pdf In PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090809142773499.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/34842299130.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16144a451d5976---48360698309.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/23978145832.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/39966936502.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/dufimatijogijutesiva.pdfIn PDF document text
    • http://prosquash.by/data/27268562485.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/lekarutazerivofobozapiti.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/guwufenamilan.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/gja6cvvqi342ilifvhroea9b15/dofejoxifafisuze.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/nudoboromopa.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210905124859560.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/56956148561.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/51148485361.pdfIn PDF document text
    • http://fructusartis.com/i/File/97558867569.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/60462693600.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/0e61dfb14997a0c99f9b860e6ea355ef/kexifinimapa.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/6143cfbb62375.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/subiwijakosabexopevo.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/5474734476.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///kawaze.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/mutajepurelukulugem.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/xotikirokuzugiva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=orient+express+agatha+christie+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D9 10860 bytes
SHA-256: cb071a7c317c81aaea5f12eed0cf639bddfb38c1729608deed5030912767c07e
font_01_sfnt_off0000ffc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC0 17868 bytes
SHA-256: d637c5698ef16313d43af277a8c907e0ef55c9259be430b987a0d2b54bf4a086
font_02_sfnt_off00012e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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