Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f7a71e7c6f88bd1…

MALICIOUS

PDF

73.0 KB Created: 2021-09-18 09:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7514139180170b0b8072eeb806157eea SHA-1: 1dee51bffe6b145efe6ff60035c51ac7fa3ebca7 SHA-256: 3f7a71e7c6f88bd1b200da2bbfa3a099fed55168766e2a606c213707b623e1ad
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The 'SE_CLICKFIX' heuristic specifically points to a social engineering attack that instructs the user to execute a command, a common tactic for downloading and running further malicious code. The presence of numerous links to potentially compromised websites and disposable hosting further supports a malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://nikacarpet.nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/22969767009.pdf In PDF document text
    • http://uptindia.com/newsimages/file///5791071593.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/qgq45eobqoqcmmtmk4h4okm0h6/zejiw.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///xuxelesebizumomifizat.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/41545209516.pdfIn PDF document text
    • http://www.toptehnik.si/images/80632503834.pdfIn PDF document text
    • http://brandorbit.in/userfiles/file/loritowovolusegemanavega.pdfIn PDF document text
    • http://carbontuning.ru/file/xabowom.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/30159768095.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/depuzato.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161454632a955b---gozenikolubusafefi.pdfIn PDF document text
    • http://dakov.hu/_user/file/votuledamumotabelexutolix.pdfIn PDF document text
    • https://ver9.sonikgps.com/ckfinder/userfiles/files/48535364079.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/161452a72d985f---runigegib.pdfIn PDF document text
    • https://techlan.pl/files/file/31425348473.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/sajejelokapu.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/71297725774.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/30450045624.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/virujiverogiwobugerojija.pdfIn PDF document text
    • http://brandorbit.in/userfiles/file/leroj.pdfIn PDF document text
    • http://atanasijornet.net/uploads/ckfinder/files/vepogamujotetobepivudikeb.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/titosixetenemodukidimavi.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/72111956586.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/54239394178.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=pillager+mod+minecraftPDF 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_off0000b916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB916 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD128 17436 bytes
SHA-256: 2f8971b2d62fabe6151f417da3e0d8529503c692768f13ad672cd5616cf5d8f8
font_02_sfnt_off0000fe35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE35 10652 bytes
SHA-256: 7566d2e0fa23f5b56946b122dc5765770031e6efd3c711de398ae682a50343a7

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