Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc1a08cffb78752c…

MALICIOUS

PDF

89.6 KB Created: 2021-08-11 03:27:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: a9415a0b98555441305e0795308ffef5 SHA-1: 0fc980af5e0a0c248220bf5fe1a65190a3840057 SHA-256: bc1a08cffb78752cd6edc94b2bed084ec1f81d09da4c5c85d36bcce2f25f767b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://vegastel.eu/components/com_mijoshop/opencart/image/data/files/bowarorilijikixoxawul.pdf In PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160d32fe52d931---80622458743.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0477007d---73334523817.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611311f16b2f6---95603849325.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/b5a200aa453d4f62105c39beec34624a/91039986202.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab619294581---jamugafafuxanujufu.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16090a8e966ef4---56177714747.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/83683050538.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/50337460780.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/46946077439.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/xibesorirevafukogulove.pdfIn PDF document text
    • http://www.puhito.hu/uploads/kaderaz.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/lubivi.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c51642e3964---gorotajuli.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/cbv5u2hd0br3vgilp0atc776p7/8792162490.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7472d3ee92---ximazeriwoxiwos.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/vatokuxifudakejutojem.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/f6d92e0bcfb2f4afef00ffa480e734b2/juxazibose.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/wuwadazeleluba.pdfIn PDF document text
    • http://travellerisland.com/files/darugukobip.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d21d1f4b556---99275120297.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/9u6uqv4j4oslhqnh5bd49mg8j8/37207278065.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1b9c6d24c---rexodalewaduxutemaneke.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160af4e2b005ab---livenisaniwufoxevolesip.pdfIn PDF document text
    • https://bem-sa.com/img/file/kuxurogip.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/au4hj5vhq0ht1g9lm3vvjegc5r/xuvifijigefasotivukuz.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/fbd607da3f0b28065c648ff92302cc37/38572476422.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=what+does+police+siren+sound+likePDF 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_off0000fba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA8 16832 bytes
SHA-256: cd8c812d2501d900ba8d0c7354ce4463861ca5afd16f8c9550ab9079efcbab2b
font_01_sfnt_off00012734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12734 10796 bytes
SHA-256: 6e2f212d3bdaaaab676864fe6ed7f1bc6dbada5406a1db5d8b80386cdf8d00b5
font_02_sfnt_off0001400a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1400A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1