Malicious PDF — malware analysis report

Static analysis result for SHA-256 460a6364a29d225f…

MALICIOUS

PDF

72.6 KB Created: 2021-09-09 20:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: eb2cca251c343dbe689ccf490557f1aa SHA-1: db5ede2df89b7582307b4fe8e9dcbad2f93edf0f SHA-256: 460a6364a29d225f6a0aae5ade526d498043b55ae7a51bffcfde0c9ecf8c8c69
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and a callback lure, prompting users to call a number under the guise of a billing or security issue. While no scripts were directly extracted, the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics suggests the document is designed to redirect users to potentially malicious sites, possibly to download further payloads or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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 http://surtek.biz/image/files/20150317_185509.pdf In PDF document text
    • https://nestsearch.in/admin/uploads/file/47342606856.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/64564771744.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/de3u9585uajj1cb04qhhp4r68d/wamof.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/51289365633.pdfIn PDF document text
    • http://scpt.it/userfiles/files/tekubefuw.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/98570504885.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/nufilusejomo.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/1b5e95fc08fdf0dd229e218886761c96/24295966723.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/kimabenadozew.pdfIn PDF document text
    • https://gangnampools.com/contents/files/zaxopipogopagalilexel.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/nevagigadafolozaleziroget.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/93136308308.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/musoguzuwigodadi.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/29608745590.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210903231203.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/23137935853.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d1d7c12de---95887300367.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/japodudeda.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/a3de08284aa423c68015eeee834e438a/jetasufibuju.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/66858272833.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/xivebugirosiruxufete.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/c65529b9a096ac8e1c74595f33f7f3e7/dikojesupivaziziwebinun.pdfIn PDF document text
    • http://irinabailey.com/upload/files/7258600926.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613785ea5d8de---64556036910.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/defumonemes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+speed+up+mobile+networkPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC01 10800 bytes
SHA-256: 27e47e5948a72c07951899a5af2a6227b8f0cabad6cbbc8737d65bf78b07d102
font_01_sfnt_off0000d49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49E 15588 bytes
SHA-256: b68f0e2c44e94f265addab3a330dba4f1673168746f0c8ffc9d647d0e0538379
font_02_sfnt_off0000fca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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