Malicious PDF — malware analysis report

Static analysis result for SHA-256 179aebc4f280b32a…

MALICIOUS

PDF

85.1 KB Created: 2021-09-06 06:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e7cbc56080ca242638673529d6498cff SHA-1: 4d6ce418a4ddb95c00db63ace7be93a69b06ed4f SHA-256: 179aebc4f280b32a2874e9da77950363ced3a855cea6e48cbab1a8a7b405a4b0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially harmful external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/27786855635.pdf In PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbf5173509---fagamuxar.pdfIn PDF document text
    • https://t2sc.me/userfiles/35153805339.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608801041ebb1---xilipamuxipexome.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/gagirumorisulekudujutur.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210729_230444.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/leleji.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16094cc2070f3b---99873658502.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17c2bdbd0f---dividuforomejewisumizaraf.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/volufinebefonirizetemag.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d969cc03d3c---31812212447.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/sojuguni.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/6135721674.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/38624792707.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/73237262479.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/lifogigemegutolo.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/95161836730.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a6c1b7261---narolopajozegisabiz.pdfIn PDF document text
    • http://rayer.cn/d/files/bifalugugarox.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/63281931276.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/diwokepozipela.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/gamejowafu.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161109dbcb30fd---vorumobepexikuvokazenute.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/11540172099.pdfIn PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/7omltff0kpn3anvvmiftmeuahh/14458558264.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=anaerobic+bacteria+%E0%B8%84%E0%B8%B7%E0%B8%AD+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE3B 10520 bytes
SHA-256: 88375e8f948b6a25f100aebbb672857bae7f1e30b585bf178030ed5334315c19
font_01_sfnt_off0000d619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD619 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2B 21972 bytes
SHA-256: 40186307185442623100e17b15e3012bffb342225ca287b99903bd0cf05a38f3
font_03_sfnt_off0001249d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249D 2128 bytes
SHA-256: ea0838c56c771baac3e7294113a37a869da30c0923c5234740d3ad99157bc88d
font_04_sfnt_off00012e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E33 16136 bytes
SHA-256: fc5e863801b68d5a040d6a4d3b47a846ad10103642bde8cd363688e11e7b0e76

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