Malicious PDF — malware analysis report

Static analysis result for SHA-256 f39f4831b86c6ff3…

MALICIOUS

PDF

92.9 KB Created: 2021-07-08 10:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0316c6c204a5ec48d4b4cec97c8eb36c SHA-1: 705ba78bcc96bfee5d0becf38d0505005b041d47 SHA-256: f39f4831b86c6ff376edeead4953585fbd3209b22f054c6227f137d6f043b427
176 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/2dd9b3b86e4f9f9195bb3d9bfc76b6af/zatem.pdf In PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/d3fbcf516685490b501530d213175b7e/melipikivebewexazesarut.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/tewemetuxebizewiloxiki.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/bumevaridokimekapot.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/d3235f1a132cb29d0759207d3926985a/37472935833.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a16f14cdc---bifefajuliwefalebuvu.pdfPDF link annotation
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16088e1b625bce---josetoxewopogirazojazuwuw.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f2dfdc1f2---zapegosumifudarakabujebuz.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606e0dd948dba---nexobok.pdfIn PDF document text
    • http://thetuckerfamilyreunion.com/clients/67950/File/ravezufonubijes.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e45fa12ee1---ladegukugasederufebe.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/68142193793.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/bd9848a3704ee9dc2e0862e7a0d36c05/31955762838.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/88069710281.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/eb76012d745a790a02072f3b1dd9b5ea/67135960736.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/c7fde7f23d868a9f2e15fac5731bb8c9/fogejituvapogibiwazop.pdfIn PDF document text
    • http://hongdacable.com/d/files/80619880942.pdfIn PDF document text
    • http://hopkinshigh1961.com/clients/878968/File/72310696584.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/90f3842ff27858643e8bb19ea3a5a4e5/74494029497.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/4b0cdaf4193c1f3c7d5e90383cf0b73d/91048280124.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/81367352476.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/93604284826.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a690bbb0de---komopugefaxunofikexipeg.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4701c0f5b1---82100186516.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/7055398492.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=recursion+meaning+in+teluguPDF 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_off0001050d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D24 10720 bytes
SHA-256: 07ffbe3706f8821c8f79c758aa189b815729483e5d08803afeb352e4dc674c3f
font_02_sfnt_off000135bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135BB 18688 bytes
SHA-256: 311fade610922f8bbf10218cb2f0cee2db7ca5e8398e99035e64518e71908568

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