Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc5824fe4e9b0ed8…

MALICIOUS

PDF

82.5 KB Created: 2021-09-19 13:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e56ff787b883abcd366a0d7eebdf7b5a SHA-1: 1d278a8673e306ac8e572e07db5a6a9cf410a78f SHA-256: bc5824fe4e9b0ed8fd0a0604408416431d9bb07b429d3265d2dfeb3d80221e1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to potentially compromised or malicious websites. The presence of embedded URLs and the nature of the heuristics suggest an attempt to trick users into visiting these sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://mtecommerce.it/public/news/file/53684089599.pdf In PDF document text
    • http://autosoftware.company/autoresponders_images/files/69335776082.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/nozabavokabufa.pdfIn PDF document text
    • https://pmms-online.com/assets/file/50463115855.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161351d87e5507---mifadadupobavonemaxexonox.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/4618938207.pdfIn PDF document text
    • https://livermore.com/wysiwygfiles/file/93439837009.pdfIn PDF document text
    • http://tomdythai.com/userfiles/files/53001883028.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/567acf0a708247b878ddef9fe76e6e59/31523689486.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/33536328840.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/sukelipev.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/lupefotarolofifamuguwetix.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/netojopitakuwuve.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109190234051147.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/tulujotad.pdfIn PDF document text
    • http://futboltotal.net/images/files/vepunubuzujixosimi.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/44390086880.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/77016449467.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/519654429.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/11329378871.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/ramededajepore.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/zadowebo.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c966dbf98e---28136813040.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/14174585553.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=boo+video+status+maker+mod+apkPDF 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_off0000d930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD930 10716 bytes
SHA-256: ec875aa8d807631070985518ad16adeda9f4df4467895cb4617724ee33b31d51
font_01_sfnt_off0000f1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E4 19172 bytes
SHA-256: 070d7bab713ac75337d18ae9dc5f057465963a1450af614e9ee3b696a2a51d43
font_02_sfnt_off00012402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12402 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1