Malicious PDF — malware analysis report

Static analysis result for SHA-256 545327e7b0825df5…

MALICIOUS

PDF

91.9 KB Created: 2021-06-27 19:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 503e5c44766fd928debf21394c8d99c1 SHA-1: 362264f8e8c1579b60d7c2587e3c77fc554f99a0 SHA-256: 545327e7b0825df5d9712a94cecae9a70ae39be8fb7c0547abf1da701047fecb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories, suggesting an attempt to redirect users to malicious content or exploit kits. The presence of these links indicates a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/bd1ee4290ed42433d05022f727384890/sigosubeverurazodefegolom.pdf In PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/c371deece4b46f29aaf0994b6e5bc472/murod.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/a83d56eef14cc8229147697f05b1f265/xesutix.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c27476c7106---53430828277.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16074f7c0c64fb---23685473266.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b8517a88b---rufoje.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202106111456571770.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/51195863340.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079fab1b979f---nixigorunevewegawurafifad.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/ab35f6f31d5301412a2e0c1734e34b7a/suwuliragaka.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/58594916388.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/4800556356.pdfIn PDF document text
    • http://medica-brno.com/files/79804523971.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/68187782395.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/32dec2ccaf76c33f33493808ad705f55/75084132703.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/tupinusekusakikafose.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/1a2ca8082ae6cfa7799b0bbf898ad802/21057546968.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/xagoxevanojuviwibovivuniw.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/6b273b7408d1e7999a388efe1a7a2d1f/nilikilamasu.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/77429477300.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e406fa2820---nubezureka.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16084774330f5b---41454575657.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=what+kind+of+cryptid+are+youPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10198 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000119af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AF 10804 bytes
SHA-256: 2ce37f97fa294ba285cd7d9abf3b0daa72fce6a6845dfcdf01a2e94d5513812a
font_02_sfnt_off0001328f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1328F 18508 bytes
SHA-256: d83ebf68c275fbb0fd4a10fd9cc5e4d9590958b9e63cf88d320628c61bead79b

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