Malicious PDF — malware analysis report

Static analysis result for SHA-256 c740e2275da01253…

MALICIOUS

PDF

82.6 KB Created: 2021-09-24 08:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 536af8a11dffe5745be4473bddb03d0c SHA-1: 40ef0aef2895470c4631606aecd598878df01a9e SHA-256: c740e2275da0125365b0a77a0477ffc023315e48d87ca151ab1d02df968b0fd2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://anitacalderon.com/ckfinder/userfiles/files/18725625397.pdf In PDF document text
    • http://www.jobibon.com/admin/userfiles/file/xisufufawizitu.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/zufidadobusologosesamu.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/6501040056.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/78049203064.pdfIn PDF document text
    • http://ridendo.cz/files/file/lezufedemuguzoxirejejare.pdfIn PDF document text
    • http://headrepublic.pl/images/files/78526410034.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/wimiwijonixe.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/kifajaxumuribe.pdfIn PDF document text
    • http://recrute.fr/files/files/nukilofuwafozidaje.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/bafavopovoratosatodu.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/94549265859.pdfIn PDF document text
    • http://potya.com/79239026843.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/suxovuxafudo.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/30102684388.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/43323535516.pdfIn PDF document text
    • http://vo23.ru/upload/file/58499078146.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109231053495167.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/96674673623.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/mugovavedofikujapegoburaj.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/c37f1b8d6651867ce58efc950fb317eb/49179213912.pdfIn PDF document text
    • http://home-plast.ru/foto/files/71914722139.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae6597587a---98934415788.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/e6f1365bff5c06550b2577570ac11ebe/rafopowogenunalawa.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/73548480513.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138df149344d---3817492143.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=android+file+transfer+alternative+macPDF 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_off0000dd28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD28 17316 bytes
SHA-256: 1b83657bfc91783c2201ab33a4980506ca63531255cbe643e365c0232a27bb2b
font_01_sfnt_off00010a1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12233 10684 bytes
SHA-256: 21ec7b6acb2448132c3275f0ef537dd8eb3d6291fa7432579b3e3b5ea027a0bf

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