Malicious PDF — malware analysis report

Static analysis result for SHA-256 892be8266c7608fc…

MALICIOUS

PDF

84.0 KB Created: 2021-09-04 13:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 37cdf550a7042ac6708037aac5739a9a SHA-1: 47e7042dcdc5d172c88610b00541c5b3aeac296d SHA-256: 892be8266c7608fc9f372f9d14599f6600c0a77dd2dd1ae1f9314dd3b0800904
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs, several of which point to compromised CMS upload directories. The ML classifier and ClamAV both strongly indicate maliciousness, with ClamAV identifying it as a phishing trojan. While no scripts were explicitly extracted, the nature of the links suggests a phishing or malware distribution attempt, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://autodilykanka.cz/cmsimple/images/file/xogaziz.pdf In PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/ibjts4pfkaggicvg7tuttkkk56/xovepaw.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/kiwifagaxasazuwip.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/4abcdd972b475c3a3b5c42d9ccaf666a/76586113641.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/mupufepineniribi.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/lamodewojo.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d28658cc01---62476685929.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/supotuxuxakewemafaj.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/bizodozosakivug.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210828015519.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/49802923801.pdfIn PDF document text
    • https://people11people.com/uploads/File/75201528602.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aba893c57fb---sitenupolow.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/gizakumilu.pdfIn PDF document text
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/kolelufezotoxuxawufasinos.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/84039375550.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfa3095856---91063114967.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/73136339386.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/98872940094.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/5669772611.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/gesexepivazelujen.pdfIn PDF document text
    • http://bakoca.hu/files/file/sopazipowom.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/2bd99562df48a24bafcd4d94be0f641e/72215416189.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=arbitration+and+conciliation+act+amended+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_off0000e503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE503 17300 bytes
SHA-256: 6d2fc607506220a1bc25da71c8a7063ad47ef847f006818166502178609e4e6b
font_01_sfnt_off000111bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BC 10732 bytes
SHA-256: e1cb64a35472d427a3dd713b75bf838be188ea775db2012ba1ba675383bac914
font_02_sfnt_off00012a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1