Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac141d9f7aa19f51…

MALICIOUS

PDF

73.6 KB Created: 2021-09-04 07:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b379ed8a195be305cfac0f2d6acfa02b SHA-1: ce7c5e9de495925d3cc15a3794be7f927f327356 SHA-256: ac141d9f7aa19f51661def0f9c6e3fc74223401db6cc791fcab2a7f2ae647ad1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 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://smidgel.ru/uplcv?utm_term=matching+occupations+worksheets PDF link annotation
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/1abbc9271c98533b477671fe2b9d0555/jogopovewu.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/99156522079.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755c3bbe285---65414713519.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/eue44cll5lj03040gejiuj9mj2/fiziwisirema.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/rusivipolovasosebitefab.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/bivenibeg.pdfIn PDF document text
    • http://absigorta.come/file/sejoxo.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/94176997478.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/52739002942.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/6453882425.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/bkc9oan6tobed91jhr8ski75mr/44237634554.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/627c2b037a192bc8f829968f8581b013/76562199896.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/xiwajopazijiduzuroralop.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/zedufosib.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160778d28e19c8---jerebejabibunosin.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/fd50a01f4b4f4294e69ab90b1ea7c9b7/25445412533.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c3346e4f5d3---loxixerovuxeninanemobu.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/senogezivobokekibufewo.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210808142858.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841aa3eb35b---748236015.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c76c87a6eca---58097670303.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/fb6094f904d551a76d43f35c81619c1c/15315427234.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/15565692735.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_off0000bf37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF37 10880 bytes
SHA-256: cf285520ea1529f01d8c4aaf0b90b1b29fd4886c7673b5c9ade288672467fc5c
font_01_sfnt_off0000d879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD879 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08B 15836 bytes
SHA-256: e11c42c4c07a5ba0b1af393477987e34a5ab4ad3c3ef04fdc91f88eaf8748e57

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