Malicious PDF — malware analysis report

Static analysis result for SHA-256 f89a5fc74f98013a…

MALICIOUS

PDF

82.9 KB Created: 2021-09-16 10:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f92c491fb8eb1b73973cfb99e93dab94 SHA-1: a965e80d25c7ea1c79ee85461a009d7c160587f0 SHA-256: f89a5fc74f98013a166eb0c636a268b3eb3c35efcaf0a598f69e9f00586bf5fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. The document functions as a link farm, containing numerous URLs pointing to potentially compromised websites and disposable hosting, likely to redirect users to malicious content. No scripts were extracted, but the presence of external URIs and link farm heuristics strongly suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://philabc.ru/uplcv?utm_term=spouse+sponsorship+canada+2020+forum PDF link annotation
    • http://dongphat.net/upload/files/kubafevobogokol.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/5e810382dd071e96a84fa900d65fbf4e/54269047751.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/sawipimuwelevasilovakoka.pdfIn PDF document text
    • http://coumert.com/images/file/dejifofonegipofedexiwa.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/47098827971.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/xurutew.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a1fa3ed813c9b34dc5db40e1d3ef3f95/48308158207.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/75751762713.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/48831863133.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16137e5a714cba---wilisibexodejowovugijirit.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/kizibobipezokilitufiziv.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/janixujimuji.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/9dd5f0164ccc06b65fb4615299258c45/54667158567.pdfIn PDF document text
    • https://hsse.cl/files/98529828260.pdfIn PDF document text
    • https://tigapilar.com/upload/files/mexupuwapijon.pdfIn PDF document text
    • http://partnercable.com/files/bojadalexonumefegaxiguw.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/korumapozokuwuzoji.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/61770931985.pdfIn PDF document text
    • https://greengenome.in/admin/userfiles/file/rukafeboxaxodu.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/45344647594.pdfIn PDF document text
    • http://hnht-electromagnet.com/d/files/83764604691.pdfIn PDF document text
    • http://raczcsalad.hu/files/47178177896.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/19237404654.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/65857234026.pdfIn PDF document text
    • https://chp-travel.ir/data/file/42434379880.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/b5o1makfbi6254coe6k1hjfmk2/75856681974.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_off0000dc25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43C 11156 bytes
SHA-256: 9d7831fbbd6aeaa2b4510e867f5f1de99195dee2392a7d92d520ec394bff4c26
font_02_sfnt_off00010e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E17 18260 bytes
SHA-256: ad5c8e7477e2a5b6e2cbdef50608a7d782338419eae36bc272cd0d6bc3995829

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