Malicious PDF — malware analysis report

Static analysis result for SHA-256 e68c4fc1e333423d…

MALICIOUS

PDF

70.1 KB Created: 2021-09-09 23:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 10bcdf45e32057ee8f1816722a036deb SHA-1: 0d0c1adafb0144c1ebd4c891e16199b4803c1c51 SHA-256: e68c4fc1e333423da71e35ca371d5d6d1aef61ff87408a58442156c1bfa90547
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of an AcroForm button with an action trigger further supports the possibility of malicious scripting or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • 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://nomylo.ru/uplcv?utm_term=photo+background+change+software+free+download+for+android PDF link annotation
    • https://vidaleve.net/ckfinder/userfiles/files/fixof.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/59774231324.pdfIn PDF document text
    • https://avela.md/userfiles/file/digavinugotoguwiwew.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/82547747536.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/51289097668.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/kutod.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/wivelogoxunubavidof.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/xozagumunujojutisumetub.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613833fdcbda7---24985959975.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/rapuzulalu.pdfIn PDF document text
    • http://theponghop.com/upload/files/36164728402.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/d06b0653e5d3bea4d75b8be1d19b8f74/95015026409.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/d9197cf98ab65a2fd7d78e818c5b5310/mugirep.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/bademesulunojuwibiveziwi.pdfIn PDF document text
    • http://househouse.it/userfiles/files/3472373739.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/94593900669.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/24191562171.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16130dd6695859---nojimujagefibeba.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/83563437781.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/82170075791.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/pelaxusagadosugugiwuwuxuj.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/55285557213.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/1782761434.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16132ca64868f4---lamegofifedabube.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-10/20210910033728242908.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_off0000b439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB439 14268 bytes
SHA-256: 84bf14d266d1e517f0205c9f243c6c70421d08ae52daba796d37af2f4fd917bd
font_01_sfnt_off0000d7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCB 11172 bytes
SHA-256: 5c6a0ebe797b706f9f65df759980c2cdd87d643150d6b3ccddf46316055523f5

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