Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a0041b6bbcd3c4b…

MALICIOUS

PDF

84.4 KB Created: 2021-09-02 01:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5b929620ba8eabd224c1657880ade431 SHA-1: da7d63be099adc83c29256bf7920dcf3ba63ff4d SHA-256: 7a0041b6bbcd3c4b9089b2f5d87e97cb00b2fd7bc64f541a3cdc07169a0cfb94
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a link farm pointing to multiple compromised CMS upload locations suggests the document is designed to redirect users to malicious sites, likely for phishing or malware distribution. The document body was unreadable, but the heuristics strongly indicate a malicious link farm attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=meaning+of+immensly PDF link annotation
    • http://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/58256605423.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/25kn604jtd7ugav4bf7cdsqh44/53259951975.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/48947244221.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fc542f229---29446408403.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/mubufabi.pdfIn PDF document text
    • http://cke.hk/userfiles/16153411775.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608580ab985d8---donikawi.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/48183500472.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/f530e79df11609125614b205cb4e2880/vakinagor.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a2ff8ad77---69136812700.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/49899224760.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/gutizowavopaner.pdfIn PDF document text
    • http://beijingteye.com/upload/files/52621814495.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d214684480---basakun.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606dff8de0bfa---19439050011.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/87009233092.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/letowekixujinogifax.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/c823a21e2f103c3759611645485e1837/mabunesoposesani.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/683a87f4753c5d9eeb380aabb1f87fd7/fumobibikedipixi.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/49410228226.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da56ae9d6c6---33920181737.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/36377767816.pdfIn PDF document text
    • http://fitviewer.com/files/file/zujibuguxonumadalogosefu.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c153005ae---3293511041.pdfIn PDF document text
    • 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_off0000d702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD702 23572 bytes
SHA-256: 391204b46f6519ebdf5fa09f6f94a741a2259eef1dd5ee79eb349892574f078a
font_01_sfnt_off0001124f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124F 10468 bytes
SHA-256: 9174e3a8e0281d5c36c01d48bfb6167f3beb41eb5aece42f0db497cd5c86260c
font_02_sfnt_off00012a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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