Malicious PDF — malware analysis report

Static analysis result for SHA-256 73cc9e6f2ae29156…

MALICIOUS

PDF

97.1 KB Created: 2021-07-07 15:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c405254e343e6ac0b2e6f566bfdb8592 SHA-1: f8a6fd9da920742d7a7cb03a5b11e8f23f396351 SHA-256: 73cc9e6f2ae291564fbc40d8f07ae0f989cce94ff40ba021956b1d22071008f5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary heuristic indicates a link to an algorithmically generated URL, further supporting a malicious intent to distribute further payloads or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • 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://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/2cdabbb3f695243e27dae2e7281e30bd/89102059573.pdf In PDF document text
    • http://biancoacolori.it/userfiles/files/nibakimazowamedojola.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/jovanikimenid.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/32785132952.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/0fa4bb532108cb1637aa4607873c75ce/78053978746.pdfIn PDF document text
    • https://amblamy.ee/upload/file/towerimi.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac35c8c522b---94784992699.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/a47bdaa8ea28ddba093dcbc4dcc58da8/58729695942.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/31005778564.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1ee9b391a---gavawovemokotoxebo.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1607d519fa0804---tusuxijixovusexarusid.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/41386161901.pdfIn PDF document text
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/fabiwaxisiw.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021063012080680554.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160a33af07c170---18566914372.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/cd6f03efa0886976abb7b7c0576271fb/rupuzi.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/cd79e2b258c55be438c82b7c5f434572/46816707590.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea5816bf84---53675364321.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075b54684d8f---nobazawudigejuko.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/8816a48fa3c5940fed379e678ba9c076/36979455671.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609236fb49129---zesemetadamugogudivof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=veritipro+thermal+cyclerPDF 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_off000114f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F5 19392 bytes
SHA-256: 2022772605df4ac9ba732cc0f7e9f02f2162ef51bf3ffa40d13493c97fab5487
font_01_sfnt_off00014649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14649 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015e60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E60 10448 bytes
SHA-256: 5c0b1cd5f61cbd42c641a5ef1c069ecdaffc7fefa5780720ae7acb9065136f93

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