Malicious PDF — malware analysis report

Static analysis result for SHA-256 61b2c63aa557edde…

MALICIOUS

PDF

117.1 KB Created: 2021-09-07 23:11:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c16ee4b00c73d9a2931e0c54189d97a1 SHA-1: d7c1127401c97f5e606c05d2ad3b9a37524c81ce SHA-256: 61b2c63aa557edde15301fe87cde1105507bc6768106163a5ce1d427704db1e6
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload storage and other disposable hosting sites. These links are likely intended to redirect users to phishing pages or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b20a0ad74f7---82263297563.pdf In PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/78872069177.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a153b2eadb---80283720791.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b6803a8ecb---lugewololexital.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/s18tukqta3h7vjat424ipm6hg5/fagemiwetajorixirevivu.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/43604114580.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f38bf802ba---12240348337.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/zelisonafodubadaj.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/5drv5163fcd2c36b2suemnugsh/kawesopigug.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/mitixu.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e8ca2aa0d---76383848629.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/89262508328.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079616c0eb74---85339071072.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/matutifukuxo.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/33485442439.pdfIn PDF document text
    • https://autopratichesas.it/file/gabejuxemitusexazifekewow.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/c388d823329c98d5b52d7cda23107eaf/74408086847.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/89696358765.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de5baef512---vabipeboralasefulenapidux.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/f4b33d2328dac55737fe2f222de16370/42344006763.pdfIn PDF document text
    • http://fittbikese.hu/files/file/werodutojofutaratane.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/1747633824.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/19641037479.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4af8222ef3---91948847238.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/fagulagofufitofipujaxit.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/kuvulodazotogasidimose.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=epistemologia+pdf+unamPDF 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_off00015f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F36 21796 bytes
SHA-256: ce621c412d45ad1c0b334543e8c78e5c4d63128919d9d02d3cbc7d751d6bb071
font_01_sfnt_off0001959a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1959A 10824 bytes
SHA-256: 0ac12665f7f64d747b34e08f87e43129061a9d7dccca756967ab4d51c9318840
font_02_sfnt_off0001ae61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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