Malicious PDF — malware analysis report

Static analysis result for SHA-256 860a1cebbc54ec5c…

MALICIOUS

PDF

83.7 KB Created: 2021-06-14 06:35:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 7cbfaaf721edf4465a137cb84b1e066f SHA-1: 19fb72102849f9d785558b123008006f6208b4e5 SHA-256: 860a1cebbc54ec5c44788f734516b19568def0aa6044ec39c6309d4f0cc1ae4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple links to external websites, many of which are hosted on compromised CMS platforms and appear to be part of a link farm. The document body, though heavily obfuscated, suggests a lure related to downloading MP3 songs, which is a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://wastran.ru/uplcv?utm_term=dil+mera+chahe+mp3+song+download PDF link annotation
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076747697d5d---wamoforoso.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/80662360270.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609dea13dc9b8---ximazolelefanokakoviz.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/25170968450.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/21a544834d163408ab09489e0e1bfad4/12506660868.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/45988456016.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/2826b6778cb4860dbafd80747bafd188/lepidekosofizixobabugar.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/c0a9b99dd2631aa4b9e3037531e68955/58473659347.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094692cc0612---80948151943.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/8901cedd3f24447977b8655148da30a9/sabuludafuxu.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/49278445694.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/80rnvlib7030h30vpp4b4a55t0/8674486858.pdfIn PDF document text
    • http://sun-eko.eu/files/file/50868619482.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b9be3c30524---6956557601.pdfIn PDF document text
    • http://tort-art.ru/userfiles/file/21125777569.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/45745555308.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD970 6536 bytes
SHA-256: 96d2c15f9600a280bb9809310d5d3703dc193243235364019f1ef98d7ecba316
font_01_sfnt_off0000e99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99A 5744 bytes
SHA-256: c21b916513423018029490bf58a110e8f80cfae2fa9d1da4ec58a773f8146fbd
font_02_sfnt_off0000fd05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD05 4452 bytes
SHA-256: 50ad8a8795b0c77dfd3952265d7c7bff5a3b8cba501eec25b9671bfea16b6a2d
font_03_sfnt_off00010cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDE 11388 bytes
SHA-256: da9528c71f076e92f6110071e374e79ae0bd03081c252869fc875a35d42afa6f
font_04_sfnt_off000133e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E8 3200 bytes
SHA-256: 3c6ae2ed909de22896216f65414ec92dd8bbe9c5daf09588b1ddb75245095878

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