Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5991711c88bb609…

MALICIOUS

PDF

90.2 KB Created: 2021-09-02 00:29:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f81035a74fafaf779852c57ddf12c3e6 SHA-1: 1cb7b873e0c0a5a1ed69a0a82e950a283392972c SHA-256: b5991711c88bb6097df7413fde42d46958d85780009e46f76f2faaa7c88708ec
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, which is a common tactic for phishing or malware distribution. The document body is unreadable, but the presence of numerous external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://pitchdecor-construction.com/user_img/files/13515675185.pdf In PDF document text
    • http://budohurtsa.pl/userfiles/file/77462550531.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ef9bb101d---lozefinejisul.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/cj90653786jmqscimrcm3r20nc/derotate.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/76842814799.pdfIn PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/96163617473.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f68c653ce---30390688123.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/6de985d839eb95e487ce218da317554d/sudisizedimemenen.pdfIn PDF document text
    • http://alphaconsultinggroup.us/vpw/images/file/mifapafoladazinunozef.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/piregejix.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace49e2a64b---vifomogexedipivixos.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/52ddf4a289365b53a4c3d12569be4a8b/wezuxeda.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de042dc3b2f---42627259491.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/dojofazaluv.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/35347050113.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/gofejuti.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/39773584286.pdfIn PDF document text
    • http://alkanboya.com/files/file///84758874260.pdfIn PDF document text
    • http://jn-zhsc.com/upload/supisezalivowominodakese.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6a531f0cf---gutozore.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/88015028172.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/dd98a96684bcf6b651bf8317c86a1431/57553845264.pdfIn PDF document text
    • http://jcpingie.be/public/files/nufozaxupowajawip.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/67494815941.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=parabola+meaning+in+gujaratiPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE4 21788 bytes
SHA-256: 4546d6ff2dedf12fed3fb17bb3e53b39fd81d308f817fe085535a17148349315
font_02_sfnt_off00012271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12271 10656 bytes
SHA-256: 4cc81e02c25d6e9164d8d6d8f478d281c5c7967d23b40c3aacac1e320607a678
font_03_sfnt_off00013ab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB9 1828 bytes
SHA-256: c65da4501f80be219574418733c77cb401adeeba023536fee640a710fe7be6ed
font_04_sfnt_off00014349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14349 16296 bytes
SHA-256: ea18132168fabf2b530fb94e9704985bd3dfeb5c3182a2116edb2f41ff37422d

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