Malicious PDF — malware analysis report

Static analysis result for SHA-256 58f271b3a34f3a04…

MALICIOUS

PDF

94.5 KB Created: 2021-08-09 09:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 56a40009ecadb0965c061495eb4bb492 SHA-1: d3a907cf1999c1372efbe59244cdd2a03a03107c SHA-256: 58f271b3a34f3a04ef807e24db94c115c28a1a9fe6abdae50c7f825d4dc91c66
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple compromised CMS upload links further supports the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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 http://michelschuurmans.nl/images/uploads/file/6573220692.pdf In PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/804ab49b4d840ba72b09ead08a7b1ea4/lalogebimofuzulireb.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/f4c89628107ea20fb40297cdc540f9df/94643459230.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/zivopabozobisamosawomebi.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/31535103228.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24b5f1487a---22138316938.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/xupujaji.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/jizopifelu.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/88216833641.pdfIn PDF document text
    • https://energooptima.hu/upload/File/74028309959.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/bf1boeq82idopd9bsq8btg5p11/79439841883.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/bujokur.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc81c3d6a4a---35704736249.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/13401739459.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878d440e584---vozerisimadadi.pdfIn PDF document text
    • https://coevent.ru/upload/files/puxususofadureko.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/b6133012320b75a5733191ef8f84f0ca/68542996765.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/51008a7039de39cbcb9f6c0644941fe2/kobejevopinarisitugutok.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/57292961635.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e0cf8296e---66328285433.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/87f6cb6e6fe4cf4eaf8c2eb9720e8b15/55372265421.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/40424714252.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0c3882dd4---47465723610.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16103dac121fd1---lejezusados.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/d3c54f5c7e0e0440e48dc1a1796496e3/97662828064.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/kiwud.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/lulasikifawumas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=lignes+pour+%C3%A9crire+droit+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11589 19876 bytes
SHA-256: 6817990f7afce68f3be9b05e0a325882445a56cbd9243fce0a48415e29cf1e22
font_02_sfnt_off00014660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14660 10796 bytes
SHA-256: e09aedba770719d08ba2c220acfb828bb859556df90ca585019b44c05941f4a1
font_03_sfnt_off00015ecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ECC 2268 bytes
SHA-256: df62a16998680213712d3d015b962c1be2ea0f13af1b45a4ddb8540038853404

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