Malicious PDF — malware analysis report

Static analysis result for SHA-256 7939c46b22be70d9…

MALICIOUS

PDF

97.9 KB Created: 2021-07-17 05:36:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 297829665c3208c4323cb46a840db492 SHA-1: 5026ffa0e933f88f80ebd0f6c165a96d3a23ccb6 SHA-256: 7939c46b22be70d9246bd97c1b5038bc348a74626cbeecb9e2a1cfec7326e150
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised CMS upload storage and disposable hosting. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it is designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 6

  • 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.
  • 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://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd58734808---62812937418.pdf In PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/r0ul8rvmtt8boahso8tb0ram96/45965007485.pdfIn PDF document text
    • http://tonystelly.com/clients/873487/File/73770794741.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3fd077e4b---72841878968.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/p9p4dcoq1jgv1pkf74l8cekqv3/23520054939.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/ab2315487320c0ad1d935b80fd59e7e9/2465769890.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/21955832121.pdfIn PDF document text
    • https://pindimana.in/uploads/file/fajuninejezejulaxaluje.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/128b5d798cf25c90c1a82e7edcf8fcab/86116010705.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/mjngvivfl91fcfl1stqnhmj7j3/nagenekanip.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/itkb9n1dmgr9r1a11n77isfnl3/mobuwoxizekowovu.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/c9ae18bcd3ca133c9c9509985c2a4576/jewepujij.pdfIn PDF document text
    • https://istanajp2.com/contents//files/nexedasonusupezakaxetu.pdfIn PDF document text
    • https://brs.jo/userfiles/files/10986498637.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/mnel8lrehm376jvv0k079nkcp4/81979892773.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/ac85487d8efac9ec74ef292eaadeb7e0/76859173979.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/c81b4239757c7a9d367df9c4981a5cde/gawufunisipovu.pdfIn PDF document text
    • http://fkhd.cz/data/img/31552245806.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/68977700641.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/fea128d81884f1070808b30a61531f86/14134363393.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/75083679840.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210627_D8B4FCFBF094DF84.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/12ffae41025ec6a9f4eacb6c52a4ec37/7470807175.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/pixalaselukepo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=youth+subcultures+todayPDF 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_off00011b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001333a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1333A 10608 bytes
SHA-256: 0de7210c6546a22372eadd36ea2845c36d086b62487465d0b32fd12700e9e82a
font_02_sfnt_off00014bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BB5 17380 bytes
SHA-256: dea51de371d8ce9075ed0aaa26918814ed1f67f877f3c6bf2d1c78eec0505301

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