Malicious PDF — malware analysis report

Static analysis result for SHA-256 a568e2bc6614dc9f…

MALICIOUS

PDF

188.1 KB Created: 2021-07-22 06:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 26abf08ab866ff2abfe13c08f5d73c2b SHA-1: c83fcd76aefde121b0b5a7ccb526317d267aebae SHA-256: a568e2bc6614dc9f6f765ba3ebe4da3509cefa9b9fb63898a5067a36034d089c
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm hosted on compromised CMS upload storage and disposable hosting, with numerous embedded URLs pointing to potentially malicious content. The document body was unreadable, but the overall structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9520

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 http://neonatal-surgery.ru/userfiles/files/sididubajowiviru.pdf In PDF document text
    • https://europartner2.pl/uploads/rawuj.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/e9387bda914e3bc22b20ee3440e23444/muluwokazitesawujetatuve.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/fb73d8852b04bf34ae1f5b04c1f18a71/73668824973.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/h89ohfilffs6vlft4jmh7h8ijg/xoxufo.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cac4e1aa5e3---6891356661.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1ef3d78c7---42203431975.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/99557481252.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6c7ce5dbc---542518536.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/nutanavigububig.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/n2pqaio0bd2aunm680i2033lfp/38251777842.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/8rupe6jk8p33iut38g47sjac7q/xikulopasewo.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/27926489629.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767a7fd3dc9---3533522632.pdfIn PDF document text
    • https://wecareprogram.org/images/file/nisulufofobuzakemudumesi.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db047fef85f---guweketoxiweno.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e607e25f87d---pofabig.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/98136982265.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b803782872---femosokumuxak.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/ecfb59c4ff23020da7f30b661cd15ba7/62780165550.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/60e6cca7a1be0fb48a3c6f4867162f93/bifuwotof.pdfIn PDF document text
    • https://gotamsui.com/ck_imgs/files/47934321700.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/70603264689.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=day+of+non+violencePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00026667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26667 10144 bytes
SHA-256: b7c0517d269236e39e379be105ea4cbf00d82c5644dcd9d4b5d554f2f86b424f
font_01_sfnt_off00027d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27D32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00029543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29543 16688 bytes
SHA-256: 768f61c57b092e3b6cafc6d210020eca1f2c739d4948f55a307bb0c6f66f194e
font_03_sfnt_off0002acf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2ACF8 19864 bytes
SHA-256: 9573f873eb12aef012222a34e9c339e224fb376ffab7bda2736ecfa532377330

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