Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0a93482c4d37cad…

MALICIOUS

PDF

77.1 KB Created: 2021-09-24 15:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b2787d7bd08c44d41f5bc7d235463d95 SHA-1: 323d1c07ec6f432c8608cab35da3132c4314ed2e SHA-256: a0a93482c4d37cad43e1e1ae31e837830deed8703c1ab4aec7dd17fab81f8662
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of numerous PDF files hosted on various domains suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://huntic.ru/uplcv?utm_term=latest+android+ui+version PDF link annotation
    • http://fujavietnam.com/images/Download/retupowokitusovab.pdfIn PDF document text
    • http://acelybio.com/upload/files/piritazesigetafoxuwim.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/63876214769.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/83715997973.pdfIn PDF document text
    • http://canoeing.by/pics/files/23132471247.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614da75b4780b---89002000498.pdfIn PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/75376219946.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/70996909226.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/ratisaxufipiw.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/voboralotukupikumasole.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a526bd1956---zuwiforominenoxogil.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/dowozasufubin.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/70146553989.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/wudebitateba.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/zexanaxupisi.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138ac1fdc277---fanunewavibusilenade.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/26769114544.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210924152428.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/rewigulabit.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144d1e0f24ab---sigigiruritifig.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/niludime.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/27507732664.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_off0000c2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F8 20188 bytes
SHA-256: 32748a2f21fe2d3141fc68f104b36d90f7d61562f1152f1ac1cabe306eedb13e
font_01_sfnt_off0000f76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76F 10320 bytes
SHA-256: 2805865492c7eebff567b855a10b43d85072de3e8d946dbfb3e46f56507f3d21
font_02_sfnt_off00010eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1