Malicious PDF — malware analysis report

Static analysis result for SHA-256 17c9f267818c55c5…

MALICIOUS

PDF

75.9 KB Created: 2021-09-04 17:25:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 313b587d86fe1beea7ab635e3115c10f SHA-1: d9f04bc99cf53189885d630d0d63188b23893726 SHA-256: 17c9f267818c55c54eb35f22068a01bfa43d7b1051ad89630b2acf19ec0d4208
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. Numerous heuristics indicate it functions as a link farm, directing users to compromised WordPress sites and other external URLs. The PDF document body is heavily obfuscated and appears to contain embedded links, suggesting an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://huntic.ru/uplcv?utm_term=exponential+decay+and+growth+word+problems+pdf PDF link annotation
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceefe9d4ee---biguwixitabopazalajifa.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d4970c2804---remaked.pdfIn PDF document text
    • http://valeneighbors.com/userimages/86944991532.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/9aqega9jn5bfi7r4vo582cbtp9/zelotuvi.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c591f2e33---11037806753.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/wedinaso.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b875e0f0622---kokiwose.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/s0o865t66msu54hi2pgoljcut7/767506594.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/gubudamuregaxudugoxel.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/80014571322.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/bewutawajixesuxik.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/59505256631.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/84312062749.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/264232903.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/7fvprkl33uj57m4jb8gril6sml/ruxazuwisedataser.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/c1065dda6a0fb6971b7ae1a4e1f6b5fc/waxanibobus.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/donutufazojorufajabim.pdfIn PDF document text
    • https://interface-graphique.com/upload/editor/file/nagatuv.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a33acfa49c2---witixipojidilifisida.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/763c750bc6494f531f5d2c737a660c45/zifukidumuxurok.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/8b3ni5kvocjfho753kth67juk7/19097202405.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/gitejexubasenun.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/22983973824.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/nebuvidipo.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df1982e26a5---walalobe.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/torobevagepigawezapud.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_off0000c494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC494 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAB 11492 bytes
SHA-256: 3dd20d05e7f905a03b1bbacedd9918285b5a2842eefb84268d7ee231432207a4
font_02_sfnt_off0000f749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF749 16156 bytes
SHA-256: 076bfefcb25f3799fd7ceb8796f2b8f5d9e07e93e9ae6a9b42bbfdded8065c82