Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f68cd9fa7561afd…

MALICIOUS

PDF

70.4 KB Created: 2021-09-06 05:30:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 70facb33f8a5ab025ef5baa8bfcc93ad SHA-1: 7405371705d7fd0713c23605c76cdbdaea65d718 SHA-256: 6f68cd9fa7561afd8109b1ca2a1b1b1efa7da5831180ccc3b70d59357cf746dc
156 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. The file contains numerous external URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics strongly suggest it is used as a lure, likely via spearphishing, to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://medvor.ru/uplcv?utm_term=hubungan+interpersonal+peserta+didik+pdf PDF link annotation
    • https://angel-juicer.com/FileData/ckfinder/files/20210812_A05E8FD24FE24CF5.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/xewufejebitosojuf.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/e1681cc011295ba3c098714aa4c24576/19963642601.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceeb7563136---23404076806.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a9c666ab7824103696434bddbc0bcd76/75386276390.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/29413736027.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/74186429166.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/70145160536.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/laluwugizirelada.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/90299372536.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3f187a430---bofolapefigavonujol.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92cae6eda---faxopebifi.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/dc2113c3c7bb6064930a1af5f05d9522/sinix.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/75340812148.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/34831217603.pdfIn PDF document text
    • http://temple.mo/userfiles/file/64949808215.pdfIn PDF document text
    • https://silga.ca/userfiles/file/pifek.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/ronumobaxelab.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/61938583410.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/38953181311.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/damowopebudusuzaxagijo.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/jixidovadedewawazesulor.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_off0000b49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB49D 15212 bytes
SHA-256: ceda1987fde642f986adc61e03fc2295899544e613a8c0925ca699cdd378ebe3
font_01_sfnt_off0000daef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF306 10996 bytes
SHA-256: 2475dfd41db41a73c3e6f0275a936f70b035a3bb92f82653d4c95e6395ae4b02

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