Malicious PDF — malware analysis report

Static analysis result for SHA-256 2072c6a7985c4bd7…

MALICIOUS

PDF

107.0 KB Created: 2021-07-02 22:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1e0f78973a6449c0ff765cf20e29d71e SHA-1: 14670f8b66aae66474d5481cf874b81e3afa62b4 SHA-256: 2072c6a7985c4bd79dc868f675ca4893835c2fa92b35c24898d8b29002603019
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are presented as a link farm, a common tactic for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9698

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://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/e8e585e7a6ce47a9a0cd103d08c39b75/74954586464.pdf In PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a8e64b9fc---66139827617.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/5d6ea82120239cdefd06d9ebc5e4baff/rokijumowojilof.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160daa4c911f2e---kafunixi.pdfIn PDF document text
    • https://airbays.com/userfiles/file/zixodatapibomomegaj.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160caff06b30ab---88090120330.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/7207ef3a6efe141abcc2fa9b24e28193/xatiminobikobabipurul.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/nojak.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/24463134726.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160d06b7d65f1f---vufuboponetisijufi.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/13062341506.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1606c97dcb9b3e---tamejerag.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/fqcdsjj5v3tlspq0koutsil16d/57239857147.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/59435262525.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/a482925da1aee56bda93427c6fb5b702/manilugodasewejige.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/28pkjdnl0hhsvr4q8td1k6d555/57155427023.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/2057a59f16ce12e54974245512bff549/68826056230.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/ximitudule.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607650ac7416a---89692322328.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30e8757865---kogajatirepupojabesajapi.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f4c48d0a3---23653967114.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/bbq29e9i3v7d52lq1osaq6hepp/33437136197.pdfIn PDF document text
    • https://faprosid.com/file/zirelitusagixoka.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/a4b52e6fb9285012d6a4af4f6803aa81/pukakuwukiboga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=what+is+a+recidivistPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C8 16492 bytes
SHA-256: 6dda1c989c519af60ba3ca90587ab6dd48f5b311b76416457c1ffbe46dadbde2
font_01_sfnt_off00012dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDE 21608 bytes
SHA-256: 198f8697424f1bbbaa3e9b928288c480a1c8fa11d532aa0cc3cf9209eee30d5b
font_02_sfnt_off000163db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163DB 2492 bytes
SHA-256: 904751be43b300d575a941fa96cf8d4a01a41d9ce75f6902e34fff71dd99a380
font_03_sfnt_off00016e7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E7D 10256 bytes
SHA-256: e245f36c63df68c2bb46e6d7e82d29c532a26db293bc2b439baa88ebf477357e
font_04_sfnt_off000185c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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