Malicious PDF — malware analysis report

Static analysis result for SHA-256 d224177e0fda5c92…

MALICIOUS

PDF

68.5 KB Created: 2021-09-24 16:20:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ca446732258f630bc8dc10fd00f28aa7 SHA-1: fcd570941a33ac0daed3b68dd36bf532a9fd2270 SHA-256: d224177e0fda5c921f145be4e96eb5c41e6af092482738c44909d546a90b57b4
176 Risk Score

Malware Insights

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

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous links, many pointing to compromised CMS uploads, suggesting an attempt to distribute further malicious content. The document body is heavily obfuscated, but the heuristics indicate a screenshot lure designed to trick users into clicking a link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://vpmemorial.net/images/file/12528228907.pdf In PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd45b012dd---26201769699.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/52113445495.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/92114989627.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/kubiwawinokupabilege.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021092204202763.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/88394755513.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/75465628174.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/xovewokexixujudise.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/kuzexitojelegowukevuwufi.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/63973556652.pdfIn PDF document text
    • http://alltechsro.cz/files/13254810644.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/woxulojunadupasez.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/fugidetesojezike.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1631587005xibidofozes.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/sememilobimafopurosat.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/gunisozuriwonokevodu.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/96e38b6dbb22731e4a73e79ac013d655/xowobovip.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/c0f8cf9a103d108ed924a8adddef2de2/43931614822.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/90117847993.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/82669609782.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/72852944938.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=episode+gems+and+passes+hackPDF 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_off0000afef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFEF 10792 bytes
SHA-256: 8171030c14431206ced9d8f9adc1169e14691cf572db781d34b63d0268fe2ba6
font_01_sfnt_off0000c85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85D 14288 bytes
SHA-256: 2047b018668cdd033e041291393882c1fb5b316557b987f71372cd539423cb25
font_02_sfnt_off0000ec4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1