Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e024321ea7b4ba0…

MALICIOUS

PDF

82.4 KB Created: 2021-09-19 06:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2865356394243c3b9785c07dcdc75073 SHA-1: ae7e419f3e537af88c1b4e9be51dcf22f1647993 SHA-256: 5e024321ea7b4ba0845736b2d961249b159fa28cfe0ade4ea4cb13dd973583e0
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the final malicious destination. The embedded URLs, while some are marked benign, contribute to the overall pattern of redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://majubesar.org/contents/files/jibilarumojarofodesuxa.pdf In PDF document text
    • http://vetcasatenovo.it/userfiles/files/gerexuwipiwejejevozeguwan.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/22311124729.pdfIn PDF document text
    • https://hinaweb.com/upload/file/delemofi.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/bidewuz.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613745c172db3---disugiriwoko.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/wekaroxaba.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/20091865199.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/57247951834.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/dikidoroseb.pdfIn PDF document text
    • https://opescom-store.com/uploads/FCK_files/file/bojabovedo.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///dowuwone.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/perivugudadomofuva.pdfIn PDF document text
    • https://t2sc.me/userfiles/kijizofepupuwotasumej.pdfIn PDF document text
    • https://unaizahic.com/Files/files/weridasifupit.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/63594249815.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/kewerovupivegopovowodaret.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/fozojofav.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/83764395572.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d49840bbc0---laxakene.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/viruvafonedebalin.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614636e39a10b---16758372959.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/6550a57a85e4d587111278f78d188acd/9802786325.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=sbloccare+un+telefono+androidPDF 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_off0000ddf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF4 17476 bytes
SHA-256: 38402e1dd640ab2637b94fbb2aa1abca8a13dc09c9e30081174bd7bc85333e0c
font_01_sfnt_off00010bc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC0 10616 bytes
SHA-256: 301c4c435bda59f1bbb46a2a3cc729680a6685f8575d53510efd28808a19978f
font_02_sfnt_off00012425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12425 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1