Malicious PDF — malware analysis report

Static analysis result for SHA-256 71b170a2e46f5f92…

MALICIOUS

PDF

95.1 KB Created: 2021-09-18 11:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 3e5c9f9dce08c4eae9e74eb7de2c2193 SHA-1: 4c6c43d5c24a31c061d272184ad3823e48e26d2e SHA-256: 71b170a2e46f5f924fac4a35982786eef6f9752137a7568946633db45cc34b40
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous links, many with UTM parameters, suggests an attempt to manipulate search engine results or phish users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417591f3288---96087685461.pdf In PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f30eb5553a---ladizofilisagisejebaw.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/40651898371.pdfIn PDF document text
    • http://freewest.at/sirajexonejunirej.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/80481072258.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/galoferewa.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/kotabubikudevuvuvegifesed.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/54772406258.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/59676395881.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/ramisonatasexurojawire.pdfIn PDF document text
    • http://full814.com/upload/files/81981489027.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/35018728884.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/gutalobin.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/lanukemodubisororowozak.pdfIn PDF document text
    • https://csn-alliance.com/data/files/45989038206.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/46500022146.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/98062015517.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/sozexenakud.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140148522eb9---56643161492.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/03d31471278deed60c8f3d89ca2cbad9/38197275495.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/5426351138.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/28604c0f16f02aa3e94809b4998a9d58/nulideli.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3f061d080---nezipuwejejuvofatuwopero.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/fazenuwolodetenozu.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/maqfvod3mho90jcvhi6vs906gv/74640915756.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/66767360892.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/46090741283.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=cheat+stamina+gta+san+andreas+ps2PDF 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_off00010e63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001267a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267A 10824 bytes
SHA-256: 5d6549fef5055faf8684f1807d6bcfb73fa3ba865afeec0a54ea698b4e595676
font_02_sfnt_off00013f14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F14 18372 bytes
SHA-256: 4f9f3dcc6343c26760604ef442aa8fb90a455761f79d72858b499fe61cec0886

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