Malicious PDF — malware analysis report

Static analysis result for SHA-256 22e8dbeb855565c8…

MALICIOUS

PDF

78.5 KB Created: 2021-09-06 13:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: abb1043570d51559a65af71303705261 SHA-1: b45c0306ee00a850eb300192dcbc1261e9e18088 SHA-256: 22e8dbeb855565c8e7667786f19e2c915cf5c1bd23cd0f0d72dba221a3aabaff
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains a callback phishing lure, instructing the user to call a phone number for various support-related issues. Heuristics indicate the PDF is part of a link farm and potentially hosted on compromised CMS upload storage. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely related to social engineering to extract sensitive information or credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://yogo110.com/userfiles/file/bokatekagujo.pdf In PDF document text
    • https://alianzatours.com/imagenes/file/7929884310.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/nagajamizuva.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/dasevaka.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/doxipuxif.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/228d667b595142af8ecae400641e49ae/23393752190.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/9716028382.pdfIn PDF document text
    • http://fitviewer.de/files/file/79027236835.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc59e0a87d5---baxunakidozubegasaz.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/tidajibofodetipev.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/b89bc3fb1dbcdea3b12050ff36c2bf30/bilaronorik.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/23113453c93bd9fe345e1504ccd58f59/53139113033.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/lopabesejur.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/duvabasexurew.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/bipelimis.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16084c26dbb639---xaliwavimidalomamatorofo.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/ov4c6ign2fici0dirqepc3bsp6/pexofubula.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071a9179be3e---wiwativuwinafob.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210815065605.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/sanakebebaxolezifona.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/c27435f35b6cf167fc930f69e4f272c6/31161843890.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea713c4ae6---tulutativabosej.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/xajigokonafoxirube.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/fabibixuxetepujogupinabob.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/p198dpp1alfge0c5ebhrh1loj3/24776345027.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/85d13bfd466e3338bd0025f789755284/91233965023.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=frigidaire+dishwasher+gallery+manualPDF 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_off0000caa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA2 19560 bytes
SHA-256: 5d4643562d71a0f9242805150b9c386fe10c1cf375df6a37a7834e6e9ad6ab20
font_01_sfnt_off0000fbf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001140c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140C 10752 bytes
SHA-256: b5b4d66190a0e73dc75ce24daa98c79b791e38ede67df4f1d35bf0b188ee3ac0

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