Malicious PDF — malware analysis report

Static analysis result for SHA-256 f307f7397d77d51c…

MALICIOUS

PDF

89.4 KB Created: 2021-09-03 05:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 160f690c8ec98513cfe054aac4882485 SHA-1: 1d2fd92a1af1d95364410b39b8a913ac64853271 SHA-256: f307f7397d77d51c9504dcc63d3aea2d3721189cfdc03d5c4963baf02452b3f5
156 Risk Score

Malware Insights

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

This PDF sample was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to other PDFs hosted on compromised websites. The primary goal appears to be directing users to malicious content, likely for credential harvesting or further infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e326736025---42194882771.pdf In PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/sowulukepolanesomane.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160827846c7c57---xumenaridogawoxixowitovom.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/23891415546.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/e44uc2f4apipu8tqo5ueeff2nv/66665154591.pdfIn PDF document text
    • http://kalikraft.com/images/file/lomof.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/66414779020.pdfIn PDF document text
    • https://ikima.fr/uploads/file/votijinoxukenesomabexuzab.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/98609209615.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b40c8c41d2f---vobapazibis.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/39819866337.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/77485272492.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160efe9c603212---ginak.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/tikobobij.pdfIn PDF document text
    • https://pasarangroup2.com/contents//files/99267052000.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f2836892d---sepumamexivebexodumogulo.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/zefozanonadisaburidopa.pdfIn PDF document text
    • http://mobilenmr.com/files/files/47630553126.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/qh5pjssk111vpeqc7h3entng93/zaxedusenuw.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608980b91bfa6---notodulakaxetogijisi.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/ribav.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/sukonogufuzinuxubatis.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/musevirija.pdfIn PDF document text
    • http://wf515345.tw/CKEdit/upload/files/jifemukamaxetuminu.pdfIn PDF document text
    • http://wjcopy.com/upload/files/fakewizabiwu.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/98242498549.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=sni+iso+22000+tahun+2018+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_off0000f841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF841 10996 bytes
SHA-256: 2d80bc94a2a3b29d14d54335d07f16167a75a46ee8de4d54cecc838e4c9ef3c0
font_01_sfnt_off000111c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C5 17768 bytes
SHA-256: 85b2b86423115c2c49f2404dd03e56ee101ae1e17f066ee5161001f74a2f9897
font_02_sfnt_off00013fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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