Malicious PDF — malware analysis report

Static analysis result for SHA-256 012a4da1ffec2872…

MALICIOUS

PDF

85.1 KB Created: 2021-09-05 10:37:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c7ab7b6fb6c1f3e02ae92e7233a54d7d SHA-1: d8bc8207ff5187a5dda1b9dda7a05a22377930dd SHA-256: 012a4da1ffec287214b97354cd3cd6e76f44ab1c7dd434012ad5a1a28dfa9de2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised websites or disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://pistant.ru/uplcv?utm_term=isotherm+definition+pdf PDF link annotation
    • http://divorce-difficile.fr/userfiles/file/78879263223.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b45c860969---88998647578.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/vimude.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160926fce9b436---77896498073.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/c3d78a659f47cf54ea1e3b2b9d712a7d/30987781644.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607613a93694d---22902090149.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/ia0sn5fsft5fn0g6hiihuonqt8/10759615424.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/fafc9e13a58b58bd2ebf4b2a57d27a8a/xaxumulivakumisukaju.pdfIn PDF document text
    • http://foodchemsino.com/d/files/22426941725.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/zopifed.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/0a7e418ea58913de9a29bbf0d966937a/18865075080.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/35748465761.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/jedeviduxurazevuwododov.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/xosefowez.pdfIn PDF document text
    • http://slphs66.com/clients/e/e6/e62fa13cff665df70d7481f632b33819/File/xitamowilofe.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/lemujos.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/sevibativijisu.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/ed2e049519bc66b62d80f035813b01e3/fokavozekaradurajex.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/65160455177.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/jr8v159m31p8o47c9qq0h3ihdh/42209979307.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb27b06cb1---25799423761.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210609024900_iwtj9c.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/91663555616.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/pizojorewitopikojagafeguv.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/javima.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89B 21856 bytes
SHA-256: bc182bcdd9bb87c499b8b9e0242be5e978c5591a00dc83672d9a02ab515b8bb2
font_01_sfnt_off00010146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10146 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001195d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195D 10504 bytes
SHA-256: 3f266755fd4ae6fa63e239e41f4de999b78c2468a8017cc26b46f6d506a7a21a
font_03_sfnt_off00013104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13104 16060 bytes
SHA-256: 64af0185a2beffa7382febdf957b2ddd2015d3985e5bc97cf8ad64f3c2914973

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