Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b100d473a4a3913…

MALICIOUS

PDF

82.8 KB Created: 2021-09-08 00:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a2508eafea7026ed389330ea1e3be036 SHA-1: 1dfb6de1e14edc4d65a622e49e4ee5b63676fb7b SHA-256: 6b100d473a4a39139a3d9dda50cfc4e133dde167583da68847493acb3f5b72c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous external URIs and links to compromised CMS upload storage, suggesting it is part of a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=antinomias+definicion+pdf PDF link annotation
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c67e02a91c---27703135589.pdfIn PDF document text
    • http://cooper1972.com/clients/b/b4/b451ebb09e7e0345645526f893d9a49e/File/26991061337.pdfIn PDF document text
    • https://krono-original.vn/Images_upload/files/2864853670.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/pasakuburabipezew.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/d4ed7550c08e0bbb88774cf9d7a46e6d/fepogopatude.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/k2mueuhubgdpb99qsldv2uc3v4/tavopagadajola.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/lelifukemek.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/31576725805.pdfIn PDF document text
    • https://maintogelonline2.com/contents//files/mikusu.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/g8bt6hadj0g02i3vet6cmh6kj6/wasajatepin.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/xorojigatipotaduz.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/8lpg1q5ms6v1o3g9nbtig5nr2e/fibalopuximatipunilupo.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/xafejodewutaf.pdfIn PDF document text
    • http://industrialdevices.in/uploads/47602042753.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107e046b91ab---3737610555.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/41441116084.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/vabitipuwukafuzenevimuxaj.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160991485bdae2---vuganaf.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/53208589181.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/o6ah8mmg14uoht8q6ptj52t2os/lujukole.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/eaul9v5g6uqfs4te6j7c1fnu9t/wegekusunimim.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a16dd893088---zaxinugikepefirogo.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/lipejamorudivipudit.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160cab4daa0679---ziniwaboripenususo.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/winawosozegunufobubajo.pdfIn PDF document text
    • 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_off0000da70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA70 10616 bytes
SHA-256: 60a45b6813699778c7209a8eac5aeeef079fa5085f010ff8901d58538e0cbca2
font_01_sfnt_off0000f2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADA 19812 bytes
SHA-256: 0c0d603a0c9862a6be223de04f917f3565e6ceeccfa240d4ef19e2f5b2f739e0

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