Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a509973c9b50f06…

MALICIOUS

PDF

98.6 KB Created: 2021-09-12 20:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f1ef1944e162c925df8ac0080ebdddfb SHA-1: da324c0fcab7199140e3c19b53d75f80c82894e8 SHA-256: 6a509973c9b50f063fe25a5f0bf87866b1df5f282700afc5a42add70930d959a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to obscure the true destination. The presence of these links and the overall structure indicate an attempt to direct users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

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://www.akilciilacdernegi.com/ckfinder/userfiles/files/lexajusuvexaluvukuwozad.pdf In PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/ddk03nqp06tk6r1lskritk0u2k/94357008104.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/37853185938.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/nenasiraxawubuzilunimatel.pdfIn PDF document text
    • http://cf2sc.cn/userfiles/file/madajarax.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/56061565779.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16135664228fd0---63484985448.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/fagokazasejemakuv.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/gevudapakibizonel.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/55451476936.pdfIn PDF document text
    • http://skncn.com/u/files/86889453912.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/e729d2accdd18bbcdffafb9d8bc0fb95/molelogalipofomubotog.pdfIn PDF document text
    • http://e-sportis.com/images/upload/runawoderemodivukilolonul.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60075153486.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210903_075920.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/52765450434.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d31a10a68d---mevawimu.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/42884675887.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/xezatosulaxaxupowiju.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/16694884605.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/vedizadexikofuvunaxaf.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/79969547483.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/kefepodut.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/96095919278.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/buzenosovafasew.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/31490510394.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ce0b600cf---wifofedulawejugelogu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=the+trove+player%27s+handbook+5ePDF 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_off00011a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001324e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1324E 10940 bytes
SHA-256: bfc0e4060d30d00c685d4707656949fa4156fbb63a15a69f7266148e7e4db054
font_02_sfnt_off00014b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B8D 18888 bytes
SHA-256: 1dcefa23bbc1d15e1f19e55417b8ae130706027c9eac661fe037dc34fe25eb4b