Malicious PDF — malware analysis report

Static analysis result for SHA-256 50766c10046fba8d…

MALICIOUS

PDF

82.8 KB Created: 2021-07-10 00:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: fe4d4ad37a9b093606cfd0cca79d4fd8 SHA-1: 6106a4a5f74b511b408e03f0e65c5978f55bb67c SHA-256: 50766c10046fba8dbf54a8e64b4a7ab5058d25dbe0daf7e45dd6fe2cc2896bea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous compromised WordPress sites and other domains, likely intended to lure users to malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded URLs suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://inwebjor.ru/uplcv?utm_term=advantages+of+using+mobile+phones+in+school PDF link annotation
    • https://al-farh-iq.com/upload/userfiles/file/jisamasalutarutimemir.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e671ca15be9---vegesuvejefo.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/n832j7ug21j2o7tbkora8ml7o7/fegafawimopokomivatuf.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/limobel.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/rixutevugisejoxi.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/4b5a8cb551876ded892343e391b347da/86057648629.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/1d603omealqmlcahhlcsp5ssfh/48357723925.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/28951879794.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f54a8bdf89---valalasila.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/43999849472.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790fb47c70c---89798081301.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/54968684705.pdfIn PDF document text
    • https://scalper.ir/data/files/file/34282878792.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/tidiwujifufudegigu.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/9685828fd232e59d1111f13f3cbc4a70/40784568117.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/47700310354.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/5ac3bda37acb538a17d17b71966184f7/49275934158.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/55577924022.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8c7781acb---26963869276.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/86500616486.pdfIn PDF document text
    • http://stylekd.ru/files/torejukabodokeparoweber.pdfIn PDF document text
    • http://stpatricksreunion.com/clients/84553/File/zedonedebedilajo.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/ske5bl2pu49heck81ojq7rhk65/52971531716.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/pexinetozizojakefivim.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16089e9875513d---83920849747.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/29442818436.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_off0000e1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F2 16188 bytes
SHA-256: 21c3551ca6209c9808c22cb517311e8e8f24651d0292b1c5b69850a65ed38e70
font_01_sfnt_off00010bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DF 11252 bytes
SHA-256: a4923b7598c253dac0678e78fbe3c9e1ac5b1f1e7be443eba76abbd2f3f5b344