Malicious PDF — malware analysis report

Static analysis result for SHA-256 985a37ca6617c366…

MALICIOUS

PDF

81.3 KB Created: 2021-06-28 20:25:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 250df8751093d530cc56f87cfe8ee185 SHA-1: 2c966666cb744c9e6bcad9f9114dc09a57ff1cff SHA-256: 985a37ca6617c366951a42b826eb722cc1e0bd93ee8207c96adf51b82cff2098
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links are likely intended to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://crewmak.ru/uplcv?utm_term=math+paheli+image+with+answer PDF link annotation
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/3ulma5osmcfrqrn8oacdqukgbf/manatopudigejojafitezot.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/36c4e1d940a2e3214e11854e7e4bed1a/dugixujanomawis.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/a991bcd7417c8bfea9507ee425993022/47917982512.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba1da8c75c---9527470984.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608093113d016---85381382707.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/86f22d762c35319b83013a239f44d5bf/45128370513.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/f97cc43fcc5262673f6e370c69668c5e/zifabonimamufizefaba.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/79765641126.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/vn29lftn415vmfkqtibt3pm3uq/50138736359.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160930fb13870c---wukunejudi.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/74989386725.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/69f96c0a964e407be4ed0bed9c18fd83/20995899826.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/2s1cnb7otfke7nhc2emdr72jdp/nixexelozadabikagulakozum.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/16823460003.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085405a0da3a---23705041083.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098384690cab---fazugozujisofunovufemepo.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/96111581935.pdfIn PDF document text
    • http://flexa.cz/docs/file/fuxepefasagenezuviwiv.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081501ac545e---vesemokupuditefegok.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/71097241133.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0b1ba5d05---nolugelasit.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cafe7f02a---lutixorafa.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/0fa0dddcde0ec5b6ff56f375776940f9/zezofef.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/kks58qtvemdf6u11a9tc5f3ls1/53837801590.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/k5ipo580tdcaf80tuo2u131ig0/56830881878.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_off0000db19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32B 17176 bytes
SHA-256: a61809e2952a4442c45cf94f057ec2d4f1b61fddae3a0b8e620b6aa0358a10cd
font_02_sfnt_off00011fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB6 10660 bytes
SHA-256: df9b29e3634c8a6cf595cff120468c246c3120de738c84591d8262ba4220c212

Open this report in the interactive analyzer, or submit your own file for analysis.