Malicious PDF — malware analysis report

Static analysis result for SHA-256 f47561303ba202f9…

MALICIOUS

PDF

77.0 KB Created: 2021-09-14 19:33:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8d55529f21e458a81077b6532f72977f SHA-1: cba05130a52a5210b0580dad61b08b96aefa206f SHA-256: f47561303ba202f93e728db65db69b232337435c59d7f7ca96b40c847febd502
156 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads or disposable hosting. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://dichvuhappyhouse.com/upload/files/19555070718.pdf In PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/59700180877.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/kukodebulisemezupelikud.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/84388211936.pdfIn PDF document text
    • https://ags-car.com/upload/files/kipagixafadugeli.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e394a237a7---kabirewebufubuvivel.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/29059844334.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/mokeluneguf.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/5773588558.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/68921465051.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202108312014495385.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210905112104_ssigti.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/raridadamabisobojufosar.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/bujaxoferogetamega.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134eb3b0ba83---84544169082.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/72238466430.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0dbbb4d7b---logufefetufep.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/72424355158.pdfIn PDF document text
    • http://kccmaul.com/files/files/nazosesowazafekuvuwutaw.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210910173759503035.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/3440015487.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/35756484846.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/59f162d22718d5b8563819a83dbbec57/38561260055.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/pefekefidulurul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=car+download+apkPDF 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_off0000c79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79F 18680 bytes
SHA-256: dace47d043a278c6ad4bc91e9bc57efab1b99b692a1e160fb358017f6e78883b
font_01_sfnt_off0000f7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F5 10104 bytes
SHA-256: 56d47a4ee0eab496321e2f6f49b921ba00f358b271213a879fdd674642f11754
font_02_sfnt_off00010e95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1