Malicious PDF — malware analysis report

Static analysis result for SHA-256 a24907771b38c7a3…

MALICIOUS

PDF

74.9 KB Created: 2021-06-29 03:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 13032655f66729c49e845b40fb82fcb9 SHA-1: c9322d21331b7b170f5211473d6db5d7949ba292 SHA-256: a24907771b38c7a389a1e1fb55fb6f3db49856c9b1fe85b98f67231c5aa32d70
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many pointing to compromised WordPress sites and disposable hosting. The heuristic firings indicate a link farm designed to redirect users to potentially malicious content. While no scripts were explicitly extracted, the nature of the embedded links and the ClamAV detection suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://inwebjor.ru/uplcv?utm_term=uncharted+the+lost+legacy+steam PDF link annotation
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079d59888f45---jimojujubugafosilolew.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/53865650579.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/1ef30e23a3f9859def3ded30fbf33f9f/89725608430.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/ndhia0i0up5m6m0tr1a2n3vl48/68999182852.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/412a727e401f49498a45a1972c330e8e/wejasatilurebatak.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/surogazitifojoreruk.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/gugapu.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/jgiscc71umg9naopcnku5e1e5k/16567520355.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/78707049480.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160706f60e94e2---97380244665.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/23118660369.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/77768604819.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/75a7491bf361a1d485108edcb527c311/wodeleretelunibow.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/57846072776.pdfIn PDF document text
    • https://hostingyuvasi.com/calisma2/files/uploads/tewijarokadovusotupub.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7415d37cb---niluzeguvaworepibejejaj.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822fc0edb4b---pubuvasumaxorufegonebef.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/0ad50237d80e4e46c48dcca4944e6eca/munutabupimosojiv.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1621187621.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/jozejuwufavo.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/64592006765.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/bomoxumuvibivus.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/36g5icvatcego8fr951itaq0j0/dasogow.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A0 16500 bytes
SHA-256: 54e9062ee20d382a6cd232b2d5a427abe118ee4cf97d33e90e4bde62f87d4632
font_01_sfnt_off0000ed80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED80 10844 bytes
SHA-256: 840aee80a9a503b9e84e04942f9db25f5c7b85c1ee3339f3444b89d3bce0f5a3
font_02_sfnt_off00010634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10634 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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