Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfd8bb65e9c99210…

MALICIOUS

PDF

80.8 KB Created: 2021-09-03 14:36:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 88647cbb7b53c840f465f50a94a780ef SHA-1: 6371648ad25eea86027cce827f9e7d3727317095 SHA-256: bfd8bb65e9c99210e77d4f015d143ef57f7d259fb7052a333c4bf09f57c8552f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://pixomot.ru/uplcv?utm_term=time+domain+analysis+of+rlc+circuits+pdf PDF link annotation
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9709457a3---65302246231.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/zuwogufofiradaxa.pdfIn PDF document text
    • http://esistore.be/userfiles/file/gizedomarotilajuk.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/wetuzelazi.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b9d1b1d98---wixukeramolarobibakenirir.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cd69b12c7---47940127484.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d18c26cf9---lewutuwipilometik.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b051471f67b---43129633772.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/temifexitozokug.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833c2f5ae38---83517335092.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610d493fc9547---kaxaveboziweruwol.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a09b998f202---12450136014.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/18297990358.pdfIn PDF document text
    • http://kustari.net/userfiles/file/nevuxuwezo.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/pewalatebepenike.pdfPDF link annotation
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/dfb24d7ff81c9084b3ce432eebe95024/kofalavafipamumer.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/sopetawajasip.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161044f07de5d3---xipuximaganeduxov.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/waxili.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/97025734517.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/fonovolowi.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/2701721083.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/80868305223.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/c193540b41aba6fac268b6ed32983b29/6779738817.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b05691101---53704839545.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609dae709cbb7---24601105592.pdfIn PDF document text
    • 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_off0000d4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DC 10956 bytes
SHA-256: dc5beb46f2f17ac0515837a83a0edaf14ce82c5b9be8d2b973416883db520581
font_01_sfnt_off0000ee4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4C 18168 bytes
SHA-256: 233f1b2d4af6df4b3423e2304ac5454e03aecaef8bc55b4100cda6d9deaff0f4
font_02_sfnt_off00011d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1