Malicious PDF — malware analysis report

Static analysis result for SHA-256 382a9a27cbd8a2b1…

MALICIOUS

PDF

76.6 KB Created: 2021-09-06 06:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d225e89b243c130b0253919cb135ddf6 SHA-1: 83665abebf98b1a1dd6193aa0e740f6344ac708d SHA-256: 382a9a27cbd8a2b16a7f5c1daafbb5431068e992dfab66f11fadc0b86b052851
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://drafthe.ru/uplcv?utm_term=extreme+summit+x430-24t+manual PDF link annotation
    • https://adikkedua.com/contents//files/bopobuzuwewit.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/061812288940.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/iohborcv6mpdbntnfabbolk18m/19338581909.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/difiwifemep.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/8e9e523f247b1472893d5cd55ea7cc6c/vidot.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/23387059411.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e983b15eb---86698134789.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db4de36d0ee---99692785439.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/kazezesofuserakaruki.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/nq4tt3272rlp93h6ui1pe6fpto/semagevaxufiwule.pdfIn PDF document text
    • http://strandedtattoo.net/file/35291484358.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/21279759812.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2655a8f9b---xegerikugekekikiwabeziwi.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba4c2203c3---30191946819.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e9d05855c---20154953455.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/waxajefusupurodukijoxokok.pdfIn PDF document text
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/dutujobu.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/fujajipavavegokokeroka.pdfIn PDF document text
    • https://isosklo.cz/uploads/suvukowetepabija.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/nogisopapi.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/97651848785.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/sovenexudekenegajibojires.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_off0000c6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CB 17208 bytes
SHA-256: 6c1e83c0a3eea85ad1ae86f9fe6ca19dcc791fd0232ec65bd5b1108182802b87
font_01_sfnt_off0000f35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35E 10860 bytes
SHA-256: b5826363740980cc7491067b01706ad80e6a331db6a506c398f1e404d2ef399e
font_02_sfnt_off00010ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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