Malicious PDF — malware analysis report

Static analysis result for SHA-256 212550459c2b20fc…

MALICIOUS

PDF

77.8 KB Created: 2021-09-08 01:14:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c497ef2604940e32763d724421c90cf1 SHA-1: cb55ea82a5e040ad74fd81f8e26db2efd6503939 SHA-256: 212550459c2b20fce2f2d30d2c1578dc40d99a6360efd405c312edbdc02209c5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various websites, many of which are hosted on compromised CMS uploads or disposable domains. The primary purpose appears to be redirecting users to potentially malicious sites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://wjvanderheidedienstverlening.nl/uploads/file/40977041643.pdf In PDF document text
    • https://bonacorsi.it/file/12125947234.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/91648779395.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/48317639819.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/492d928d692be0eb04e4433adba000f3/3103607268.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611579e875ac3---zetodijezulezitejemufego.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/38082163940.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/e00c1b4479a4b9b5baaae42b867bcdc0/forimomiraxadosazovevu.pdfIn PDF document text
    • http://intersonik.eu/upload/files/wagumuzogowexesaxofuwo.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/7882789169.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/35482200581.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ec08b99ed---14292075002.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a40ff008a2c---buxamiruto.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/51450891522e7602b1216eea5b922ee6/dobije.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/53136041810.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/37038091459.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/51903198398.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/816ea2027b04e4a73009fa09cdd244eb/sabasujakegumaxi.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/fidisosuse.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/5fc2ff2b0716602c3136dd577b786e47/jifaforovalobusiposo.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/zafowafiw.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7576735b4f---14361134450.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+make+money+with+fiverr+and+clickbank+pdfPDF 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_off0000cbd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD6 17036 bytes
SHA-256: 8aa62f20e672b14f23eaab7b4b3e2d6730bce601c5fc31d41943b1aafe64c6c3
font_01_sfnt_off0000f7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EC 11208 bytes
SHA-256: c310f49e4f27201799503e66784fbcc5729ce122912d9b7ab219c3203032b0ac
font_02_sfnt_off000111bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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