Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f50e35e816c5d25…

MALICIOUS

PDF

91.0 KB Created: 2021-07-07 10:54:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3efc6304db607913038437e92ccce7cf SHA-1: a53147e6662ce7515c61822f2898cbd5efb57438 SHA-256: 8f50e35e816c5d2550cf276355d8cb08231249be20c94161d65fa7949461cb18
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple potentially compromised WordPress upload storage locations and other disposable hosting sites. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a malicious intent to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/03cnauq47ke5ja3ce86pu8frm6/gajubewijekeb.pdf In PDF document text
    • http://starlightskiothon.ca/clients/4/44/44db284a3a4a6a3f34f8f2fa71918f98/File/57510780765.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/1c059aca6dcac36dcd84c091c8e77e7b/23624186000.pdfIn PDF document text
    • https://isosklo.cz/uploads/60700901973.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/bunefakewexosato.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/difazox.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160755c163767b---52946931882.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/72299460848.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210625055218.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/64262600707.pdfIn PDF document text
    • http://liyangah.com/Upload/file/70795275083.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5a1a5a216---52803673421.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/jewonuvibunakimiwemozar.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7ac7da519---78926411834.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/59412123042.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/bd1901b0cf1a58f9b5b2eb827c35c200/mirelad.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/d851b7136a7951dce3dfa33df3cbed11/32169046486.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/20052636994.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6d6d1e898---xijavogofube.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ccb3371c586---defokovakakaxa.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/3049754650.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/d24747740e9941b0001653d6eec4b576/gabarulaxaxidugan.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/m5pcm2c3u9k1goc001cu712d14/31555397751.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=convert+pdf+to+epub+without+losing+formatPDF 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_off0000fe1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1F 17532 bytes
SHA-256: fa637d494b0e9c0911ec94866a23c558f378b4f05e58213b910fc677de04b662
font_01_sfnt_off00012c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001445c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1445C 11368 bytes
SHA-256: 88aa2fc36da29b6624ab89c7918717e871edf9464e8095fe098b0cf1966cf015