Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c829972f630a54c…

MALICIOUS

PDF

86.1 KB Created: 2021-09-09 02:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5255be2d6eb04a8710bb7cffad7b75b6 SHA-1: fd0eff0b6897b2e035fca4ec9e721f5018b295b1 SHA-256: 3c829972f630a54c4be8de214f059b45ef6bf41581ed2be88a539333992f174d
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as containing a link farm, with several URLs pointing to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. While no scripts were extracted, the presence of numerous links and the nature of the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 https://activepymes.com/pub/file/90054869225.pdf In PDF document text
    • http://cariboohose.com/userfiles/file/narasezogomi.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/83254891717.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613434223b11d---ripewojafofis.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138e4740aa05---54087688019.pdfIn PDF document text
    • https://rippa.pt/files/file/33271534023.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021090701322773499.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/gagaxiwitixomebozeb.pdfIn PDF document text
    • https://hobbypet.cz/files/file/mixalikufoxoduv.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/nibuvuzurewunufuvanirobef.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/giwoluguri.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/gutinidusisew.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/20692514972.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/wejewufagetufidopowe.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/guxademurozatovitofalemok.pdfIn PDF document text
    • https://fishboat.hr/files/65494033917.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/56070148767.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202109/file/210902111058490093i41pf11kn31v.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/fevubogomorom.pdfIn PDF document text
    • http://aminotp.com/upload/files/48154288796.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/18709931016.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/2e8d5b9abd3429221af66484ef8c0a23/61443906186.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/wotofa.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/kinobusunub.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/tojomejene.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/zorafoxoromabaxa.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/joxogobev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=iphone+trying+to+send+imessage+to+androidPDF 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_off0000e995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE995 10856 bytes
SHA-256: 93e35b94d8c08e118339b059c9b68e009fb6c3503e6b1644b228db64dbdca0e7
font_01_sfnt_off00010244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10244 18488 bytes
SHA-256: 21595737e5d49840f5fe73ee71b5afbbd2d07b3528d7ea78d2852d27b5e3fb25
font_02_sfnt_off000131ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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