Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a95f9c15f48f498…

MALICIOUS

PDF

98.5 KB Created: 2021-08-06 08:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 907ada3f46f44a667237f61e09727f1b SHA-1: bb7cbf0f416a9ff404d0dda92960c23a33b8df7d SHA-256: 9a95f9c15f48f498f73a929e4001314c0179fddec66e70bc1d411cab3c889a0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, identified by heuristics as a link farm. ClamAV and ML classifiers also flagged this PDF as malicious, specifically noting phishing and trojan characteristics. While no scripts were explicitly extracted, the nature of the links suggests the document is designed to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/f4a7c5448779ddec665c937ae7049899/fizabevetipivu.pdf In PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/o6c4oa5g968lteie34f9vo4iua/vibotegubep.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/af61b4e56036a72d7bd628c7ab37bb21/74041888780.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc41fc16cbe---62214645348.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/ekrc8uvifohavif6mf5qr2m7ro/75593756317.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/37637362540.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/wodevezi.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/dcd207d825d2a849fbbe2a3460050ba8/vobuzaduzubavefulekari.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/b2728643fc81137df420913597e597f6/26742054816.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608452989e559---5902108897.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/dadilevazewarukubu.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/20215111224477413.pdfIn PDF document text
    • http://odumakus.com/uploads/files/6173878126.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/enijudoz.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/fd2ab98c94246525da4a1247a797f9c2/satugomisaxasajabuke.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/bejatisuralusep.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1cacedf1a---nuzarukipolataritafo.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/banamorudutizepeji.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/89024088478.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/17916443845.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/tumonikenilivewu.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a240746071e---40381951931.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/geguropomoma.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/31794793165.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/62507988685.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/nukinijosezi.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/fejiji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=write+the+12+steps+of+surya+namaskarPDF 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_off000119d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D7 11048 bytes
SHA-256: 96979d19b760d6e049b8a2b90e5732bc6f3003e42c8ecafd43c81637959ed7f3
font_01_sfnt_off00013387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13387 19648 bytes
SHA-256: adc2bfd00dd92d34a4d7f9e41f4e5c3c6efce76c15728338f742d356ad770a64
font_02_sfnt_off000163d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1