Malicious PDF — malware analysis report

Static analysis result for SHA-256 8033e1fa62244416…

MALICIOUS

PDF

78.7 KB Created: 2021-07-04 03:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c38359c24304891f60730d24e8e86533 SHA-1: 412e2f374a9d15b2dc67f25886e42a8b9e638d43 SHA-256: 8033e1fa62244416cef7b2afbba07d3a5171fdb9dfe78fd9a0b64534add26948
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads, suggesting it's designed to host and distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cructi.ru/uplcv?utm_term=general+microbiology+lecture+notes PDF link annotation
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0fcdc80f2---wapozezaxalakiwaxexapide.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982a4da9d85---vumusokulabaredomogu.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a1730b948---72771484472.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/4071879139.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/xikex.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/penazoleduvagi.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/p1rsngnbptv86rr9u71haq5884/60508705770.pdfIn PDF document text
    • https://ladangmimpi2.com/contents//files/vejimotiborapoxu.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4fe7ac58c---82833374893.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2acf1aa130---xeweji.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/80283872409.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/lt5opjjlfhb8vdfvig05idudr9/padesasorinal.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/74796582394.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bea41061531---7518702874.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/274fcf5db07d8bbc4ebac031fd0289c2/rowol.pdfIn PDF document text
    • http://topas.lt/userfiles/file/dusewarad.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093547b05537---72735361195.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/c1349460b8bffc0bb853d5c2c3943102/99004314221.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/gugegubirigav.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/60bb8704847f5.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/5681965559.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/daxitazumemasajazaxenos.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_off0000cf03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE715 17232 bytes
SHA-256: d9b17cd765300b37185527068c16950abb02e115783392d3e350faef40fd051e
font_02_sfnt_off0001141d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141D 10968 bytes
SHA-256: e9d5758dcea77e1404763b9f4148acaca2d5d74552323d08bbee3ad338478121

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