Malicious PDF — malware analysis report

Static analysis result for SHA-256 7350e11c41e03a37…

MALICIOUS

PDF

142.2 KB Created: 2021-07-18 16:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3a15c7c27d26f7bf98606cfb64ac85dc SHA-1: 6f108539e31c91e4f4e2abc21456572d370cd809 SHA-256: 7350e11c41e03a37945627a359d5fc6d67c8cbe0db4a64b032544c84538343aa
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting domains, indicating a link farm designed to phish or redirect users. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of multiple link farms and compromised upload URLs strongly suggests a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

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 https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/872b96847b212ddef955cce3b320fd06/nebakepopudamud.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e861e6cfad1---womunarosekiduwodap.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/fc1e2039a22364b77509fd4871b024d0/sowenirimewi.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/8brkhg0e764i4oero4vu8fam0g/91930704284.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/1vq6git94asovtdl3corld5q43/xedemogekixopuvefij.pdfIn PDF document text
    • https://ksuskalology.com/images/file/gedoxezeleso.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/medepurawuvazugebesolirix.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/fa5c0c941f816ec2ba0e0cd2d8d614e9/47029718316.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/33275828fd554bc65ce1a52934dfb7d5/setenoxisokokesiforuleji.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16074152e08791---24390632212.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/85339893078.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/042a0cbb72207ab1604693b33a2f982a/25333505539.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072893b0581b---beloxanalasaforugumupuka.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/fozuwejurone.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/kafasimakoretananatefa.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/162554608960342426676.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072ac7294f51---jelijekadofogat.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a250fb945c7---93390223068.pdfIn PDF document text
    • http://utopiasacramento.org/clients/0/07/071cdeedc048305be324eb10ab8031d4/File/61196539936.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ed8cf349d---61955203150.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/56786406100.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/sinebowiranagatixakimosof.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/boguwixutimavi.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cc29acb0bc8---xuwikewe.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d591bd32c8---24964423029.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/98000126878.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=a+puritan+theology+doctrine+for+life+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_off0001c691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C691 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001dea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DEA8 10924 bytes
SHA-256: e9c5937fb2b4e55db492a5b9a72f78f7fa831095fdfdd5d8b354557445442e61
font_02_sfnt_off0001f7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F7B0 18780 bytes
SHA-256: f32f2fbd5c15d98d3317b2fd740c0af4669e33ccbe389c12da1a9e15f863f0cd