Malicious PDF — malware analysis report

Static analysis result for SHA-256 146e2f510fc3a421…

MALICIOUS

PDF

86.0 KB Created: 2021-07-24 18:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d5b22ef101d8e3d5aa4565f435ab78f9 SHA-1: 2156b4c6bceddf427376f336a3e81ba3736c08aa SHA-256: 146e2f510fc3a421446c08f58f4c429ab870f331c74fe293d4f97a97d4c3a524
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, designed to trick users into downloading further malicious content. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate attempt to obscure the final malicious destination. ClamAV detection and ML classification confirm the malicious nature of the file, likely serving as a downloader or part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/a7083d5e717e293b81bb13d9cb679343/xasopikigutadexafep.pdf In PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753816cc407---95119033693.pdfIn PDF document text
    • http://apple888.vn/luutru/files/78062876657.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/dr4a9ls6til3rnsrv7fjti7tj8/gezaredugalumikatusapetas.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/3gsh24ab5p8bmb3fqvjgl2vn3i/balif.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/75467357539.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/76621027328.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/guriro.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/48a5a46b5a07e571fe7e847f4e5bb2a7/litezikuveligofizepis.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c0dd8f915c9---xugiz.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f896c73501b---jonezubegaduwugujeguja.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/681bc99327b62da77601e8a3904af01a/87217253385.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/20113010300.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40bd55a9ab---sefiruzunalimowu.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/115fd771a44c60d24daa9e98a2cf5c80/27619953022.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/b9340052215085421e4d2c5e8b3f435d/xifejosuxogibiloge.pdfIn PDF document text
    • http://teknis.it/userfiles/files/supabulerigipubimamejolo.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1622016466.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb90287046b---wurilexuwumiri.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/c32929cf0cf95cae3aa5e7acc12f9745/webixokamijibibuto.pdfIn PDF document text
    • http://rogo-rotterdam.nl/files/92877288547.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=miraculous+ladybug+temporada+4+descargar+megaPDF 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_off0000e9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A0 18272 bytes
SHA-256: 1dc5f6e77214b0104d5e8735deff297c209c3b673126fd599123f64b297c0d12
font_01_sfnt_off000117c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD9 11180 bytes
SHA-256: 51ff8237a59abb98f36587926ad6fa354038de12b880a2fb7e18f038f6455045

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