Malicious PDF — malware analysis report

Static analysis result for SHA-256 49cf46cddfc515ae…

MALICIOUS

PDF

81.5 KB Created: 2021-06-27 15:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 07b45087058b621c0ce7e367e2aad39c SHA-1: d0b5a4f298ae57055d6a1908e2b27645f4333074 SHA-256: 49cf46cddfc515ae1b308cb0d83f419444b3cad7997301c771bab657286c2bc8
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites acting as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the link farm suggests it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://faradbox.pl/files/file/76817837025.pdf
    • https://gachbinhduong.com/upload/file/vosagejazubajexasufin.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/jf4mgmiahoqt7hqtjeka8jvgk0/kasovidowe.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/943c6cf4cfb88aeb58647ccf577a3d02/87299971841.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/dfa05e7554d4ad3914524ebd6b0d4522/kuparelofiguvaja.pdf
    • https://purefeeling8.com/data/file/32014329020.pdf
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607d673bd1115---28525737771.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/45a353c2ad2ed83ab9a7c2123528fec7/2191094724.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bae6f337050---dabokuwuw.pdf
    • http://debandhelder.nl/ckfinder/userfiles/files/36756072643.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb4be4c202---9388498164.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc00b00415---rijoletomefegoleriro.pdf
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/97187182413.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcc26a9bbf---rexibaxozi.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/0d3f047bebed45ec08f4e83a8b021fe0/rubuzepivufotogunanejux.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c560d89442c---budosaf.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607313d8a87a3---8266493731.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b4371d4f1ee---fusebavomi.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3a4fa17e9---wazididubijewiturexafen.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd06433873---bajoputixi.pdf
    • https://holocaustresearch.pl/nowy/photo/file/24893825903.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4e3918c42---xonedaruzinesosarax.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/44ba3c58bc67070893d908db951fe271/gaziwataxetup.pdf
    • http://inspiredindianfoundation.org/uploads/48261221815.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9c0734156---kaxaxi.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/d95418dc11c00d841db73ec20b6cf9b3/linubawiribes.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-9/20210509224840661753.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=becoming+is+better+than+being
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db9a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9A 16792 bytes
font_01_sfnt_off0000f3b1.bin
1b8bd1e964221f27ce04eb0669ef46ddff829b00eca9044bacb2b0c1366b614b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B1 10824 bytes
font_02_sfnt_off00010c7b.bin
98c77879ffa919e8e6f7ac64c2ca67ae3629071b87b9fbf56b025606baae2f56
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7B 17040 bytes