Malicious PDF — malware analysis report

Static analysis result for SHA-256 45418de8e9ea7a36…

MALICIOUS

PDF

92.0 KB Created: 2021-07-01 13:12:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 61ff1ca46831379d12e966c2fd94f71c SHA-1: 88f59d3f5cb5b1aa02624b669cc9ddb8bf98d294 SHA-256: 45418de8e9ea7a3638d2fb97e967b5179ad4c19fa625f4b05229fdfac23d19e6
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, but the presence of embedded URLs and the heuristic firings strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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 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://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/c1536804f37741fa58babc447ecbc9dc/mirotobalerozesigip.pdf In PDF document text
    • http://yuhenganquan.com/userfiles/file/20210621075354_2069596044.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/bakurakumonunodasinezod.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/84571918998.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/revojotexidiku.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/vizuzidazafobozafavit.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/olp0e51qm6be851p9anp2t1r24/23997330259.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/25320182421.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/zozolokusal.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/79862603797.pdfIn PDF document text
    • http://skylineidaho69.com/clients/c/c7/c7306e0a9cc1d421caefa9c307ca601f/File/14847590520.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/57228505725.pdfIn PDF document text
    • https://elektrona.cz/files/file/47654404357.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607905b4045e7---poxezomogi.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074531e57d19---36219801877.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/28a9772478159f18735879b8cee6ac19/zovesuvamobomagufenatexu.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/2438a44bbb6b6d7fbce92abc07fb2c41/37975318947.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608246d7c367f---58055391689.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/44499157293.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/8526102f96ac3e524a9eff08b34cc98b/mejoxo.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607987f85f2f5---49544531510.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/tofufolun.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/46896383507.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/37675554820.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=nj+driving+questions+and+answersPDF 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_off00010365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10365 17252 bytes
SHA-256: 84baae7fdb32dd6e756a99dcb5feb0fcfde545ad870065420804eaa98b90685a
font_01_sfnt_off00013073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13073 10884 bytes
SHA-256: c622fa22cb4728bc3fd93a25fbcf39318787bcb30654bc8eab7840b22b2c1097
font_02_sfnt_off0001493d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1493D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1