Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b9580649a4ef20f…

MALICIOUS

PDF

88.8 KB Created: 2021-09-22 21:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d12dd4a0337cf33e0be87d0dbccaf473 SHA-1: 2d33f71810dd425a39b785cc78dfbf5f4a18d2c5 SHA-256: 9b9580649a4ef20feaff6a49acbf78d8ecd622b7912308f26d85f797f37a8430
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous disposable URLs, many hosted on compromised or disposable domains, suggesting an attempt to distribute malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway security. While no scripts were directly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://vhktn.at/images/content/files/83441413420.pdf In PDF document text
    • https://faguaflowers.com/images/admin/file/95563983261.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/wamuvobox.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/kidikumedujepej.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/bamakanajuromamudutuvuv.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/sumanorujav.pdfIn PDF document text
    • http://tradotel-riviera.com/file/86071494754.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/bojozumunarewajaza.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/13064630544.pdfIn PDF document text
    • https://tarsiman.ee/files/file/milekusifobij.pdfIn PDF document text
    • http://image.dlib.vn/libedu/news/bvu/20210920/file/sizowegalugo.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/wupefipifebusipekujirome.pdfIn PDF document text
    • http://cocoal.com/uploads/file/besatejigadugenu.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/42251374803.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/4b822687629b5c24a2f6bdc8bc5eb967/guxupobokela.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/7db87ec44338e949c6c3c6745ea87eae/mivuwulajafef.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/tolus.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/96134946529.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/52562285978.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/78507324347.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/87649154752.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/56166482730.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/22650362605.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/18350223904.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16137f202e6e9c---renixezunosulex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=android+studio+flutter+run+ios+simulatorPDF 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_off0000f308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF308 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1F 10596 bytes
SHA-256: 1a47a50e0509ae5b81b6e4f8658a4a658163bd5576e006803b498b571c24365b
font_02_sfnt_off00012354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12354 19108 bytes
SHA-256: e55c79a2a066ea124aacbcdfaa4063cca79d4363e3cb75b990f90485233d9829

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