Malicious PDF — malware analysis report

Static analysis result for SHA-256 01bf97152756cb92…

MALICIOUS

PDF

89.6 KB Created: 2021-09-06 23:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7d712d90f1e997a03bae5550a32d34a4 SHA-1: f068d20e3e7a15782a275ed056af78a751bdf354 SHA-256: 01bf97152756cb9204a2a7b26ca402cff3c7245cfa6ada44019c80adb1799da7
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, suggests the PDF is designed to redirect users to phishing or malware distribution sites. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating a link farm hosted on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://krisoc.ru/uplcv?utm_term=inteligencia+emocional+para+ni%C3%B1os+pdf PDF link annotation
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/b12cfeba9876b6789d7356d83717b2da/56686787067.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/0402d7b30190118f16be43d90b147350/zitovuduzaramizevesogaso.pdfIn PDF document text
    • http://erex.hu/upload/file/51738676208.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/13618557845.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d80b0f16b---memegujapatesiwo.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/wasiruluniponimewob.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/302cba7f0a7e8f90803fd915cd08c9de/tejedotaj.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/13495886395.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/8stpt5aa8egiml7oo9nqpfm0t4/23716755831.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160985ec6d54fd---susinudegeb.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712eb828261---23628232858.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0e0b8b29e---20441217657.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021051900160973499.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/247d0a0a7f7be80e3374c0fb2e82dee1/vadefawada.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/15163359965.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/ab363b7b0ddb997d642a4fef9a28e685/bifavir.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/386dbabf108be0eaae74091005b61964/kawafuwedomepevukufosej.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/topowebitowu.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/29148799223.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/25057023877.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ceeaa66598d---vixese.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/zojilipalepo.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/r29vvnbre71a77ikmi9ucp3gbv/82834035346.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/9281748709.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/lerefobopabugora.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/vigewexabetivodi.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_off0000f0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F8 20232 bytes
SHA-256: b84eec531a9cc74d201f0e25670e8a163d800c45ec4e9d5c3f481a394b80cebc
font_01_sfnt_off00012487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12487 11120 bytes
SHA-256: 045f313d3eef851eae0482317b186e12eba8275a2c9a14b9f1958924de03a969
font_02_sfnt_off00013e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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