Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc5d89698e08c43c…

MALICIOUS

PDF

95.5 KB Created: 2021-09-08 03:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 84174681b3a24621f233a08fe8857e4e SHA-1: c474060c29f5cd3d448805137b7a3a6252ff07cf SHA-256: fc5d89698e08c43c29184b7b8fdbac86a2c3e1f23f96cca80c307e12e7e431ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous websites, many of which appear to be compromised WordPress installations or disposable hosting, suggesting an attempt to redirect users to malicious content. The primary attack pattern involves luring users to external sites via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nomylo.ru/uplcv?utm_term=ac1200+linksys+manual PDF link annotation
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/f1e5d0c6b11b555e2ed03f071ca97f83/xotagabopofefekixoxuno.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/tixitirisat.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160762f88d150d---rofilufofubowolasix.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/3394143877.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609820ae90bd9---26093560073.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/vexipisifilikarit.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/65261c359f8037ee35f595d46c2225e8/tuzojade.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4976f57526---serig.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/mbtb5nh3qmg1l5aaglkqg9e7p1/2453699739.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/40389549319.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161253cadc2dca---29146201575.pdfIn PDF document text
    • http://celiapopememorial.com/clients/4/45/45605e685ba8a3b32f56966823665796/File/80391996418.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/128067940.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/lukepimufubop.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f71e5271bd---sunilipopikigep.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/51931218339.pdfIn PDF document text
    • http://prestopc.it/upload/file/remixamuk.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609baff36d23f---45386048059.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/23112361091.pdfIn PDF document text
    • http://skolky.info/foto/images/file/38066520197.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/mexixumodoj.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/nulofusez.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_off000111ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EA 10524 bytes
SHA-256: 1c97fd24fa2de0ce01d35bd73036db2596abe21fc7557a8c1941c4147a17ddf8
font_01_sfnt_off000129fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001420d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1420D 18068 bytes
SHA-256: 5ab1ae1e9dac60b7fb5436a8b6d5b859dff4a01ea662d16cb1f154d6e856bb52

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