Malicious PDF — malware analysis report

Static analysis result for SHA-256 099cd9d7fe02aaa1…

MALICIOUS

PDF

74.4 KB Created: 2021-06-27 16:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 48e14fd1c39ad6ef4172d05e82f8df3c SHA-1: f47c61d1d6cba85089b75f443a5ccf4c92973f2f SHA-256: 099cd9d7fe02aaa17a022b224020642dce8be5b9b288eb12b9cce0fc04e4eb82
156 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. Heuristics identified it as a link farm pointing to compromised CMS upload storage, suggesting it's used to distribute further malicious content or phish users. The embedded URLs, while some are marked benign, are part of a larger pattern of directing users to potentially unsafe sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://area34.info/wp-content/plugins/super-forms/uploads/php/files/3rbmaj2a3e0huufn36595ki414/wulijotaroboxedaxelidamu.pdf
    • http://chongthamnguoc.vn/img/files/13343475133.pdf
    • http://novussiteyonetimi.com/uploads/file/55710009720.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/35952a44c60a10ca9aaa300eb0a19b52/mibabiz.pdf
    • http://9meclinic.com/ckfinder/userfiles/files/30125837156.pdf
    • http://bscsaoner.in/ckfinder/userfiles/files/nigizitobikoze.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/4f064c78bbfb1badcf6ddac09734f10e/99017550560.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1cbc4ffe2---92855646261.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d3af296a5---taxetefirowoxilizu.pdf
    • https://solener.info/ckfinder/userfiles/files/99962261137.pdf
    • http://bomtvplus.com/data/board/file/20210623180729.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a90ed06dfd1---doresukamegob.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830449c1046---zeriku.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa2a8b0b8d---42925989362.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/b9f287cde5fc65601154564595b9fe5e/fubesonumebo.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607781b584017---74263125318.pdf
    • http://tipiland.net/upload/file/94684654352.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f219c18495---rikavajumis.pdf
    • http://brilspa.ro/userfiles/file///fizivetesafuwula.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8697806bc---rukimufanelolakokogufax.pdf
    • http://euredit-editions.com/userfiles/file/49755184775.pdf
    • http://verduciautodemolizioni.it/userfiles/file/kebazarolawali.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/53b91afa16e728852953bcd476140d97/pezanonexusuvodagirudovap.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093a60d04957---xadenusereb.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/qd84f6sbifb6gcvkm63rcdiplo/vapiruzawifa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=to+build+a+house
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c352.bin
c08789aacd21ff35141830bfad649f5ed359c928c5eb55829211fed6017aa30b
pdf-font-stream PDF embedded font (sfnt) at offset 0xC352 16188 bytes
font_01_sfnt_off0000ed40.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED40 16792 bytes
font_02_sfnt_off00010557.bin
a7b4632e1768eaf33690f686a76e0973106cdee94d917dd252131d4dfe272124
pdf-font-stream PDF embedded font (sfnt) at offset 0x10557 10244 bytes