Malicious PDF — malware analysis report

Static analysis result for SHA-256 144adca418c4d247…

MALICIOUS

PDF

93.5 KB Created: 2021-07-23 07:30:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bac731a791b13e68ccf0d89f6c842093 SHA-1: 614a162788e4bd78f8984c5ec6526dd9fdd336dc SHA-256: 144adca418c4d247eaf9fbb09c9c88bf316a98206f2deff968739ca110e77b7a
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve further malicious content. The presence of multiple compromised CMS upload links suggests a tactic to disguise malicious files as legitimate uploads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb7fc44143---zutuwakariwijajetipekunoj.pdf In PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/0f58e16486dfdcc393b0728607db140a/26506027154.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96269de9f0---26547909783.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/bufasipitilemadimufopufif.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/xotowabatapuzoru.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/mavowojudenovowixifobow.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f31652c315---zusorevapo.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/23839794113.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841515c47e9---dajozi.pdfIn PDF document text
    • http://sammyurias.com/userfiles/files/20758624215.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/270bf4ab9c9530cb16325231e6058265/78736445927.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/duvetamiwivi.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/17664926491.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/24dcb5bfd8df8f25983c80e7fd7217f7/sokuteluvog.pdfIn PDF document text
    • http://novichiha.ru/pic/file/bubimitevitoxakifelupafu.pdfIn PDF document text
    • http://elskenecologie.nl/files/32161255036.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/erms2vpalhl537a8ufe2pkooog/lemizerulevimi.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/fadilexejilutiv.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/csems7o75at9blq9vvo1p1m87f/15817357065.pdfIn PDF document text
    • http://abnicum.com/files/file/fevepefajonekakololexojo.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/14972926323.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/18578192734.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/au011dhv3esmr3g22q3duf14g8/xilorogitisofozuwigawu.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/zoxomobepowuveva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=gasp+in+surprisePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EF 18772 bytes
SHA-256: 1e6396badff288c948cb12a465bc48e2ceac1bdc617a497ab2b9727488c32d2e
font_01_sfnt_off000119a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A7 19000 bytes
SHA-256: 29c515a086d0a7616c7897cdbb7e274258143176d67351ce74a2c0d81e00f9df
font_02_sfnt_off000138b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B0 10120 bytes
SHA-256: 033fba76a7a2693e08cf9efed412fccbd6988d7c75e4eac5447af45c725eb0e4
font_03_sfnt_off00014f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1