Malicious PDF — malware analysis report

Static analysis result for SHA-256 63a3a30134d41d14…

MALICIOUS

PDF

110.8 KB Created: 2021-06-13 06:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 584ecfa25ac00f085a14a6da09b89682 SHA-1: d83d051a6fbe4bcfebb21e8482461f7cd115bf73 SHA-256: 63a3a30134d41d1493bf7a2112e7b820f0691f1661011c382f0977314bd510bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://oniceh.ru/uplcv?utm_term=physics+class+11+handwritten+notes PDF link annotation
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094aa0adca87---bexusakasij.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/8624e7109348f8c1d678dfcbe8953c6e/48429712834.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/64b865f05b33b559debbe299ece5ee5a/7828267430.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/d15132371a7076565e131e1c9919f8f1/zojifizosekedotome.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/9b9cafb2110c362c9da76851f5d313c5/lezabutolesexuxoso.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a37c0746cd---niwusineriruzem.pdfIn PDF document text
    • https://ms01bet.net/contents//files/16586805440.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf9895ff60---xewigiwejazopopofov.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/qecf0ml2i9a2ic4mrfklvfhhho/68744043052.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/8a7c65ba463883cb474d0ef3124327ba/forosebomu.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/210dc7771c4d83243c42360b5e879d34/20515298901.pdfIn PDF document text
    • http://mopron.ru/upload/files/popilolewenilezer.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/zibubatu.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/usafg2jrq94qo5sg8s6ak2i5b1/gizepawijewisinafeperon.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/d52cb05edc09e68161e958f4cf797375/toxopawafikit.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/tekom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn 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_off00013f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F65 5276 bytes
SHA-256: e30093ac64100726b3d0fa9ec3ae277afc959c6a5def72fbace7fb310d4ad466
font_01_sfnt_off00015161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15161 3720 bytes
SHA-256: 6539b129c5cd894636dc8f40f53a156c00c8f46378ab4f137c96d687a1cff6ed
font_02_sfnt_off00015cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CC4 11908 bytes
SHA-256: a01cbbca5b05f3227e616c641fb3285d8b0e3e203a4b813ea326e3b2f825498f
font_03_sfnt_off0001859c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1859C 16296 bytes
SHA-256: f0b0938756bdf42015189bc81068530ce50f13d791449a767b947dbebff1b960
font_04_sfnt_off00019b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B70 4748 bytes
SHA-256: bfedba0e9733f04e2483179a3be8dc15e416e76745c5f42c45bf9d4d8c7fefd7

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