Malicious PDF — malware analysis report

Static analysis result for SHA-256 714eed2355038d0a…

MALICIOUS

PDF

80.9 KB Created: 2021-09-18 08:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 36c155e7cfd2d4e671a77432e3dcca13 SHA-1: 469f5eb1c77bac9332d0f80bf7ba6fdabdf68c42 SHA-256: 714eed2355038d0a13bd7b85429a315bdf65b7cfdf1f67597aa5e14455ee2814
176 Risk Score

Malware Insights

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

The PDF contains multiple URLs pointing to compromised websites and link farms, suggesting an attempt to redirect the user to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to exploit vulnerabilities or trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • 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://medvor.ru/uplcv?utm_term=how+to+read+snapchat+messages+without+them+knowing+2021 PDF link annotation
    • https://middletonchambers.com/ckfinder/userfiles/files/25567975648.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f654e84330---81367513123.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210913023437.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/27340836697.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/dutosipelenufig.pdfIn PDF document text
    • http://mdtrend.hu/files/file/rewarumulupu.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109042310594274.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/21229362218.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/jobirebifipazaxofibin.pdfIn PDF document text
    • http://prompol.com/media/file/mekezisetagiz.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132635d7029c---7400299625.pdfIn PDF document text
    • https://sambelteri.com/contents/files/gokewuzodiwonekal.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/28332188469.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7e23001a9---69166158957.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3268e6071---63876489084.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/zojepuzakodasedeset.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/23695428719.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/kezebajubidok.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/pezagoxe.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/kulojufi.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/14010934290.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/88861214571.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_off0000d4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BC 11476 bytes
SHA-256: b3f146ec6a8e107c567f60c8666c8d4566d7a438d07551f88997910d5ec36f42
font_01_sfnt_off0000ef92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF92 17884 bytes
SHA-256: 7a4642ddef31c377fed82208c71fce505e24805cb878420bd2fb9799107951e0
font_02_sfnt_off00011db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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