Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1791e285fb79c7d…

MALICIOUS

PDF

95.7 KB Created: 2021-09-21 15:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9f20b58aef8174c75e1dc9f17eba196d SHA-1: 0bc6aa239fe047cfa4a3c712395ae1458d1cb944 SHA-256: d1791e285fb79c7d9e18d894519dec2e1d8d7b0b76114985bb0bd9819a1d7931
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure itself appears to be exploited, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://crysiq.ru/uplcv?utm_term=create+your+own+watch+face+android+wear PDF link annotation
    • http://inica.org/files/file///duguxirisuvifob.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/dosanejez.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210919091425_184636986.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/91105419844.pdfIn PDF document text
    • https://ijpdua.com/contents/files/38098711026.pdfIn PDF document text
    • http://raczcsalad.hu/files/18204177836.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/a2sffnmdkdt5o8cj736k361536/wepal.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/67143598381.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/baradet.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/xekexuvuderufiwiboked.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613814263d624---76428491807.pdfIn PDF document text
    • http://mhzsolutionz.com/userfiles/file/4572583797.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/81174465814.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613413e15144e---3175597135.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/20106517281.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/sanujivapusoxem.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/31428814766.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/wofajavapunoliwi.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/976032595.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/woxori.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/56002852278.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/pupigodupesodina.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/kawuguw.pdfIn PDF document text
    • http://hingliltd.com/userfiles/fodafuper.pdfIn PDF document text
    • http://asliev.coco1490.com/upload/file_folder/file/vavetapetukujuvumuneniba.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141232cc629b---xarupopoxipifosaninu.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_off00011025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11025 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001283c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283C 10688 bytes
SHA-256: 4a6d2ff5c9e0ce63ab187fdd2d28a4510fc50806ced4e1af2a30f301169bee51
font_02_sfnt_off000140be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140BE 18132 bytes
SHA-256: 93b973118658aee3e118e506ee6a5485702b0c5213639005a64d6bd79ab29080

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