Malicious PDF — malware analysis report

Static analysis result for SHA-256 478b91dd94b7a164…

MALICIOUS

PDF

78.7 KB Created: 2021-09-08 11:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 20242890c5772bc66ceba1b1283526c5 SHA-1: d0fbca9b54272f221980b6db5422084fd8039549 SHA-256: 478b91dd94b7a1647f7ccd0f113fd552e7c3aaca0882078fe0b4df0593895b42
176 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. The heuristic 'SE_CALLBACK_LURE' indicates the document likely prompts the user to call a phone number for fake support or billing issues. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it may exploit vulnerabilities or redirect to malicious sites, aligning with common phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://anapro.com/ckfinder/userfiles/files/nagelupiwokidumofopub.pdf In PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/33374588630.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/81570217111.pdfIn PDF document text
    • http://watsonwilliamsreunion.com/clients/82103/File/logabaz.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16076c791c966e---povokom.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16077893f750f1---mosuwireb.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/d0d2542b39da0700458cd481d0855036/28361199705.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/terogiramunesetotid.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160914d8926045---28585060185.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/jaresevi.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e31303e58d---boviwefakap.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/18727024143.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/zabuzoxexoniw.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/77669511286.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607472b0b034f---fatasasivufevorozodagi.pdfIn PDF document text
    • https://actor-conseil.com/files/file/58709502358.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/46846656002.pdfIn PDF document text
    • http://surtek.biz/image/files/20150109_034145.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/ratabemonov.pdfIn PDF document text
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/5681331554.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/nesulipugowomav.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/75669313551.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/42510433809.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/0475239ebe9a6e8d6294eae67291dada/sexulunifefokef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=les+nombres+de+1+a+100+en+francais+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_off0000cba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA3 19284 bytes
SHA-256: 7e91a12ce5dd4954816800e65e86d491d38f506e3fd4be062cfdbfff2cad9719
font_01_sfnt_off0000fc50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC50 10908 bytes
SHA-256: d58712dc160c950e490339482ce77f590455ea2a4cca6ac01b28db409ed08424
font_02_sfnt_off0001154f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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