Malicious PDF — malware analysis report

Static analysis result for SHA-256 35b8ade9d2ccffdb…

MALICIOUS

PDF

85.9 KB Created: 2021-09-05 19:33:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c9591fd505572305eded894ebab11749 SHA-1: b6d128d6cf3b0e27ff5abcd11a10b7e23295b514 SHA-256: 35b8ade9d2ccffdbdc9dbbf65e83d3e1095a0eba4890d5e14af30518ec472d46
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to external resources. Several of these URLs are hosted on compromised CMS uploads or disposable domains, indicating a likely attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://clubsecurite.fr/webroot/upload/files/rojumofofotukifiw.pdf In PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a86dd943a01---sibilasexajenubojoxaler.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/zulelepitabutelegubediko.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/77944542948.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c40de98b568---20215331087.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/61327434235.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/32773477162.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160df7bdfdaefa---dunuresorubisetuta.pdfIn PDF document text
    • https://33mobility.net/uploads/files/kufaguzetibugidadulugibog.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/peketosi.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/93337349225.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1610314e987ea3---95845311537.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/gasolakedavapesanezi.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/6695865865.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/58emct7j5g721tmbvndua7mrf0/7618851826.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/junitilunifekosifuzosasas.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/xovin.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/lopqg991m466qal7s7dghjdurm/71771268162.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/61050956215.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/51871287976.pdfIn PDF document text
    • http://cl-pub.com/files/files/jafoxugur.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/xefodivotenufejujaro.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/rasadeko.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/46894494228.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=addition+activities+for+kindergarten+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_off0000eacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACF 10888 bytes
SHA-256: cee8354805d62947c3670bd2e0fd148e5cc1c11f523501965102b0c104361331
font_01_sfnt_off000103ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FF 17656 bytes
SHA-256: a43e00974a4c88ddd3956e04ecc9f002cd3986fe91453631c04e08fbb35a7a2b
font_02_sfnt_off000131b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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