Malicious PDF — malware analysis report

Static analysis result for SHA-256 79753e01ebedd3bd…

MALICIOUS

PDF

81.7 KB Created: 2021-09-06 11:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f568c77bf8584771c7a9427b86b90c52 SHA-1: 1acc1a9b8d61421ef0357df47de34b39fa3d6ff6 SHA-256: 79753e01ebedd3bd89cb9ec9159ce6b7a80011e243e5377c0111b31fec55cc51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The PDF contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=distillation+column+theory+pdf PDF link annotation
    • http://gorisum.net/fckeditor/upload_file/file/16479937392.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/vopolo.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/potusamuzakigiz.pdfIn PDF document text
    • https://pmms-online.com/assets/file/xofaruzipeweteparibigive.pdfIn PDF document text
    • https://activepymes.com/pub/file/58539000382.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/vrpc7j95g6vsvpb0tc31csapsm/mugexukirorejuge.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/tusivigudigifulifeban.pdfIn PDF document text
    • https://xedulichhaiphong.vn/images/news/files/jejevelawexokusumuz.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16099861e2fd9a---takinodejewogetobiretu.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/zididemobawagevulax.pdfIn PDF document text
    • http://blueyee.com/upload/file/180327061914.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/d68fddb7d4635498fc59936152cf969f/25115250914.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0784ba1c2---88595398587.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/49523653363.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4832493e18---63058049018.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/161012f0dbd5dd---86333178848.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/8d44d502250cd1e8ce5070471399fa9d/4562540431.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160dbfa4ddca7c---33955487647.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/jesiwisebakesosuf.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa25f19e086---pekotanutewexofonuvibopup.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/ropulutanufunanavume.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca96ad25a9---62548652569.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29571c8e46---ribavu.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffea788830---8457517808.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/widovinuvokavezakoboza.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_off0000d99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99D 17540 bytes
SHA-256: d0b9b0e00693e75d60ac20c14623d3707253571b256fa9ea8d2bd743e0d1cece
font_01_sfnt_off0001070e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070E 11100 bytes
SHA-256: 89b3596ecdd18467547d60996844863a4589e86ba01030012259ea21d11bffc9
font_02_sfnt_off000120c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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