Malicious PDF — malware analysis report

Static analysis result for SHA-256 76c71edb7f283be5…

MALICIOUS

PDF

80.5 KB Created: 2021-08-18 09:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 25ad49960f382f51db4a4cc100b5e30f SHA-1: 736820659a85fb6e8b3e3efda1d37971f3e096ad SHA-256: 76c71edb7f283be5e9c5030e6858fcc7d2784c01f886a3298d44c924e6d4fb20
156 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs, many of which point to compromised WordPress sites hosting PDF files, suggesting a link farm designed to lure users to malicious content. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d37c644565---defoxizilob.pdf In PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/03d4399e5c5dd2d715a789d378b12e34/sadunepapujulidu.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/0a1aea7e11b649c3145ee351df03ebb2/82804876185.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210806212317032.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1bfd139f3---59293389666.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77684460636.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/92a6kl1abliqha33otd1okcpoc/81979671868.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/57361146771.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d54ea2c8---55917082230.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/xitixiji.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/26423097810.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210609123320.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094572110b4c---31537207081.pdfIn PDF document text
    • http://malverne69.com/clients/a/a7/a743c233813d1a1dbf5c38c484d85cdc/File/sofasik.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160c26645ad2b8---60005681871.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/visadikavupamagome.pdfIn PDF document text
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/f6d192453fff25d7966aae1abc26e84d/feromipomexasujeragegesuj.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/50113583520.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210706203439_y81nbf.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/rm28asvg0jhou4gmhq69ev42q3/14823755292.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/27341720295.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/gozepakikasuditin.pdfIn PDF document text
    • https://inverpalmas.site/aym_image/files/1327813718.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/7d8e65c577dbfd9df77203af531b66de/99859633449.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079af037a697---63219071609.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=opel+zafira+repair+manual+free+downloadPDF 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_off0000d50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50C 10664 bytes
SHA-256: c658f2892ccd1e198478f8cda35bc07929ba77f0c0fdefc0a9b0543546fe402b
font_01_sfnt_off0000ed81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10593 17612 bytes
SHA-256: 8eda749e78a51798dc4fc72f48caf1e653e49bdfffc79c3523f58d82af4af36e