Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bf28d4f089f41ab…

MALICIOUS

PDF

74.0 KB Created: 2021-06-20 18:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: eeacc27672a145dab06480d930d59a77 SHA-1: c96693c9dac4b9de14c7af9e055cc19d3eae3d63 SHA-256: 6bf28d4f089f41ab0263c95356ea17dfaa5ec9aeb75c9d0c2370bae1706d78b3
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF document flagged by ML classifiers as malicious. It contains numerous links to external sites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The 'SE_CLICKFIX' heuristic indicates the document instructs the user to execute a command, a common social engineering tactic to bypass macro restrictions and initiate payload download. No scripts were extracted, but the presence of embedded URLs and the ClickFix heuristic strongly suggest an attempt to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://allytemp.ru/uplcv?utm_term=idm+serial+code PDF link annotation
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607642aaef9a4---segenavabexineguj.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/7919919495.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/4jcf0m545h9mqqfl8aqhh4sg0j/47307734046.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/2752647483.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/278c0f0988b6d15132d6736d5a6f8cbe/23735642571.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/pafilinokepafenamenimawiw.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/04aj4sas4nsgc4amhqalf7gd1h/75953210664.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/e9f86f00683780a319a4250f7bfdc6a7/lejurow.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16091277f7fe09---digumewixewoxewesan.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/66030412202.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/premd42mmj8eakh2ko1nbhrth3/xubuxovufig.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/25b5349be0b3805efd204dabe521dc67/lorufoso.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160be3f9646df5---32553721186.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/ba54f02f8472647df6cd2abc19f385ae/16119303208.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ae38f72fec8---86062392695.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6ae04dd62---jitapezosebinudazudefaki.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/7d12934c5b0a559db5aa84ca55a86427/80247983258.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD858 5020 bytes
SHA-256: 839e1e63563fe6defc2742c1a05ee11a88d961fe17667a729c5e07b7147a1e04
font_01_sfnt_off0000e94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94F 21732 bytes
SHA-256: ae90a46aa54d3919d973b2780e532035570cf5e428daddf4d9ce7e6343bd9179

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