Malicious PDF — malware analysis report

Static analysis result for SHA-256 83fbe310e607a61d…

MALICIOUS

PDF

76.7 KB Created: 2021-09-04 15:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 3e09ce5f9fc8012a92eb5a0bfd19d378 SHA-1: db36869a8c220bd8dc825b30176c075f9c69d228 SHA-256: 83fbe310e607a61deb0ee548855767ceb5242706fb78bcff7eecd725bdc95016
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://oniceh.ru/uplcv?utm_term=components+of+mental+state+examination+pdf PDF link annotation
    • http://lechioutdoor.com/userfiles/file/jalolowumimijapolem.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/fobujeb.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c5abd4393---26506103388.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b48e1e4f94---gexevokizexonavoputikur.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/66313018697.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612460a98f64b---93485648444.pdfIn PDF document text
    • http://sivam.pl/files/file/mesebaze.pdfIn PDF document text
    • http://eksternest.be/images/file/31824893399.pdfIn PDF document text
    • http://unseretochter.ch/images/file/gaxalubeturawod.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/57999533458.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/97070985317.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/rolivereveme.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/97322765180.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/51090548488.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608866b062141---nimesogavelawepazitovib.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/39573544980.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/mafejowolakizodibilesugom.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/26275234909.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/zipefaditutoputese.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/rasizubofamujiv.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/suzekilazelepimev.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7f851ece4---65519600505.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210719_89BD789527FB42EE.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124575e8a775---9448667825.pdfIn PDF document text
    • http://huefpdf.org/upload/file/48237293676.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/tejafimejutalire.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160708c95ec25f---zisezizalakakebabo.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_off0000c644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC644 10692 bytes
SHA-256: ef45bf7e16d688087711e4ab348d62d4d8367ca611137e1f075e93a4fdfad7e7
font_01_sfnt_off0000dec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC8 17780 bytes
SHA-256: 58a71035064a16807bbd3e748fc75b8fe4bcc3b4a6258e85de91f0693e0d4e3b
font_02_sfnt_off00010c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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