Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b4b053405c37de9…

MALICIOUS

PDF

85.0 KB Created: 2021-09-01 15:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5807faa4920f832cd20dfa479e719312 SHA-1: 05e96f217f2bff2701018e794a8b98d5ebd50a43 SHA-256: 0b4b053405c37de9a52ca5f3394a9353a33c598e54f16dc0eb8c2080f3109f12
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to various domains, some of which are hosted on compromised CMS platforms. The presence of these links suggests an attempt to direct users to malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the overall structure and heuristic firings strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://catamma.ru/uplcv?utm_term=grammar+book+family+and+friends+4 PDF link annotation
    • https://acrgroup.nl/userfiles/file/83938319985.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202105181555434295.pdfIn PDF document text
    • https://khanikango.in/file/gagibiwupamusigelubuzo.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55983827425.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/84202753271.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/71979635563.pdfIn PDF document text
    • http://mths1965.com/clients/6/62/626de2090e8268457c7577d5e8b87900/File/suwixujudezet.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/ghbqvo74ccjdu1qimukg0lo640/vavivijogonizurebasuwubex.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160711f95dc6a7---24519546998.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/86327584243.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/c703107e79405764252ba886dc00a882/71589724158.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/65984996630.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/ph0r2vt6dkkorbvttsckqvb8l5/76529336151.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/67661341672.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/guteduzumadozoge.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/fezipagokez.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/rarariwuxasekob.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e93d33199---fubijudatal.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/89638471709.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/ptsmvt7bbj7cujqe75j4jl7m53/vetak.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/revezidoveku.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/90554144231.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/6d0c7594969cc32800e534577067c165/gonusewebo.pdfIn PDF document text
    • http://nhanloc.net/userfiles/file/siloli.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_off0000e612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE612 17792 bytes
SHA-256: 0790ab833464a21839b5908a51712cce5715dd035e2851c7c1f080fa1c166b67
font_01_sfnt_off00011457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11457 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6E 10880 bytes
SHA-256: 1f204ba3e2ea0d535ff77388724c205f7ec0ff2f82047f17f3a6b9628fa2be97

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