Malicious PDF — malware analysis report

Static analysis result for SHA-256 2808f29a1a16c0fc…

MALICIOUS

PDF

83.1 KB Created: 2021-09-20 12:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 34e3507a5a5b60c73fd1447ae1107b4a SHA-1: 01904b3c7192ef3d844c257942d7e27fde512f74 SHA-256: 2808f29a1a16c0fc2a4bea1b046a195d03bc57db13c4c68ca5793875040c86be
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or are part of a link farm designed to obscure the final destination. The primary purpose appears to be redirecting users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=asistentes+para+android PDF link annotation
    • https://loppisidjupdalen.se/images/uploaded/file/mibezusugodaxufubef.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/45960938800.pdfIn PDF document text
    • http://manu-transport.com/documents/file/rawur.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/reveniril.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/99337771065.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/55762014233.pdfIn PDF document text
    • http://terfigyelokamera.info/files/file/rafalepuzitumixamewewe.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/50812635465.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/20558376441.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc149d73a7---71443848293.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/94485040582.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/97500371538.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/40433952324.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/pasakomiruburunuxenudoz.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/33373742517.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/beriwu.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/781889caf09cc964da0d6d7c2ab56cbc/6718742126.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/67411799389.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/28189686801.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/pudagazupivex.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/jujagokokovafoloruposasa.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/6717f8cc7b9807b7c0ff372a1d5daade/55593514703.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/87793518764.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_off0000e095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE095 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AC 10320 bytes
SHA-256: 2d50ac53572fde607542a7319111403df22d66e160c88b67d0f0576e895e8f69
font_02_sfnt_off00011011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11011 18576 bytes
SHA-256: b65223a94e9c2698e1935af361fb4a043c82cb54ca78dba8b4e9bfc853d29b28

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