Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b648a0c6761211…

MALICIOUS

PDF

70.1 KB Created: 2021-09-01 15:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6895bb3ade8faa7d0eac92c75d82ea46 SHA-1: 365af6b9cb2920679e3187acf3b8230caf197696 SHA-256: f1b648a0c6761211f50b82f8e9d72a1aa41b93bf2da233cd21c687bc494baf86
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16097bac8bece5---47925124518.pdf In PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/kfqdp9ucs7d5dhf5b4nn43aic5/23282238795.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/2109a9facd67fd0a8751ca4f05e38a10/rebapovadovu.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/9548712742.pdfIn PDF document text
    • https://ancoraeducacion.com/images/rabejutixejidumu.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/13095247073.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/d858a3061b9305c88ff2756493708ffe/bamumikamaziroguk.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1ceea027a---31292558078.pdfIn PDF document text
    • https://foulardfotografando.it/file/karugibanimir.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/a47c75a3787c511e2897c94c73d31980/58816047858.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/be86b5c55028c31548d490e2c1cc5e01/23682690313.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/jirakizetinazurotexiru.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612627a3d1c13---80003707541.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/sozonoporowunejofefegipi.pdfIn PDF document text
    • https://hiroyoung.com/data/files/wekagid.pdfIn PDF document text
    • http://pahsclassof2005.com/clients/d/d6/d61c4c031b0f3af13d3e88110ef3a3e1/File/26984497627.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/12741208266.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/baa7a9591441e0f7f82dcaccb274e53a/55737818152.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607049862300f---59512341237.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/57693112200.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/levujumekiwusejugefubez.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/42049808579.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=hey+there+1+student+book+pdfPDF 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_off0000b45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB45E 14828 bytes
SHA-256: 4839271543e345f1ae61e9af1fd92e90860b3c1be0ec4cc6dd08f735b8071117
font_01_sfnt_off0000d9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E2 10784 bytes
SHA-256: 691f67b487674c672ba873dee0dbf507d42a7d268bdc3fc875f0e43473c613c2
font_02_sfnt_off0000f27e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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