Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a307e9dafac4a5…

MALICIOUS

PDF

77.7 KB Created: 2021-09-25 11:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cd970f4d2fa0244350fb367cd5b40b08 SHA-1: f43550b41fdecf3dc765fee2d4f6a5271fe607e2 SHA-256: 89a307e9dafac4a51ad1d9453e81db748a9d7e19b9f30e6b35025b86827c4520
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF acting as a link farm, directing users to potentially compromised websites or disposable hosting. The presence of numerous unknown URLs suggests an attempt to distribute or host malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/1fa7b320f09a360c801a23c3fef59854/tanivesof.pdf In PDF document text
    • http://fence-alarm.com/userfiles/files/forekinavixegegozesawu.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/28494262834.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/nagukujorirapakixoj.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210920151836.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/38776040025.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/dizufipemimokad.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/bugafa.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210916072525_0rt2i1.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/gisafikuduvonurodanaxojiw.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/butisawofatemuba.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/65879605792.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/10091364757.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613433e785c73---xovababefelibavurabo.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/31150515685.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614ca821af0c8---97828394789.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/5q5slqnef67efghesc95s88pc9/3874718648.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/844fecf64e9266e243054dff4a6ad05c/lameganowojod.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614643789199a---27727257192.pdfPDF link annotation
    • http://s-pack.kr/userfiles/file/20210917074217.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/najusuziwukulamonol.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/23379854735.pdfIn PDF document text
    • http://boki.hu/editor_up/96228955782.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/71466576984.pdfIn PDF document text
    • http://cichanski.com/Upload/file/majelubudotinefebozet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=sims+3+for+android+cheatsPDF 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_off0000b5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5CC 17156 bytes
SHA-256: 85109573411508cf8476086219392a3650b32418b1af059a90140315f9327c88
font_01_sfnt_off0000e1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AB 10940 bytes
SHA-256: 84335175fcf09e8a05b7e0008e32be4d6790643b0338a9fef8243a0b9812539d
font_02_sfnt_off0000fad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000112e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E2 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684

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