Malicious PDF — malware analysis report

Static analysis result for SHA-256 be8173dbee4d1719…

MALICIOUS

PDF

83.7 KB Created: 2021-09-01 00:13:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: d2a35efb68c749cffddd7119e4bbbe13 SHA-1: f2b8aee9b9115e5b58cc9eca1629292b778fce57 SHA-256: be8173dbee4d17193da8055acffe8f0207f380dd6565562b4d8deb52139eebd0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

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://hashtag.school/userfiles/file/61818507454.pdf In PDF document text
    • http://mesterek.net/tmp/xepazumepiponemizizug.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/kuboboxafatibutikinoxetud.pdfIn PDF document text
    • http://maihome.hu/admin1/file/bivakinodativofidaduzoka.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/serivokatoreditobu.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/9822260279.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/1f4cc5ba27bc702c9baa5f2dfd4ccf76/mapiwufolonodibuzo.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/49736404477.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abca0c1ef92---90816088362.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/feluzifelexaf.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/039fd6a2b99b7095b87bf8736b355e60/51139248727.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160791e2863754---zajolap.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ac162a07c6---15088005152.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fae4acce89---wavejulapodogopila.pdfIn PDF document text
    • https://khanikango.in/file/56932972190.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a023e8a051---46735083841.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd2286bd9---gopovajunuf.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/lexunubedipiserixaro.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/86010512682.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/10454263602.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/tibasokamenikoxojapir.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c239aabaa---pabigetopusoxeduzikanaza.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16093e8af5029b---98513614803.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=measure+of+man+and+woman+pdfPDF 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_off0000e2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C4 10600 bytes
SHA-256: 4c664b9a749c8d63efbbc0b84ca3b04fc6eee026a5191dcae2aad59d7e285968
font_01_sfnt_off0000fb05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB05 17236 bytes
SHA-256: 6f80825871755fb252453cd3fdf6ac826026ac5775e7eb16150cae1037561f05
font_02_sfnt_off00012809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12809 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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