Malicious PDF — malware analysis report

Static analysis result for SHA-256 a92c246528cb8c40…

MALICIOUS

PDF

83.1 KB Created: 2021-09-06 08:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 22a4cf4507a9f2bceebc8d707b30e8cc SHA-1: 59e643c510a28aacbcb2df61a294c3fd84fcec32 SHA-256: a92c246528cb8c402c6a9f552c1b9235a298c4be5bc4e8ea54d3b0e426ee9054
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of these links and the nature of the heuristics strongly indicate a phishing or malware distribution campaign.

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://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757a3090b50---62289275875.pdf In PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2b332646d---23818971054.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/wovuv.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/e30d250715bc44defc018df72fd18f34/45924858216.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/ha5jqcinip4r6bjgu0auhhq8js/5694212168.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/mosufovavujaviredazuniveg.pdfIn PDF document text
    • http://att-na.com/upload/zijipubivakifigog.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/c966a03619a0c08d7adb64a3adfa882f/41672368972.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/gipubugav.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/seneluduma.pdfIn PDF document text
    • http://pensiuneavalentina.ro/app/webroot/file/natugepomibu.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/muzilibubo.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/vevop.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/29845837920.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a819fad77c1---96205504718.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/91d4f42e5019e9cd650a42366f586976/pelekunivusikulifiwovef.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/xorabubesijed.pdfIn PDF document text
    • http://lighthouseofworship.com/clients/44803/File/kifof.pdfIn PDF document text
    • http://vanhacollection.com/images/files/winesumokezutunasofafegu.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/efac134ab2af855b30f1e7be8c7eb80f/71224715083.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/sg7gu4rjis9b0unv0nu36gpftp/49767686085.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b43a1294b1f---75644964791.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/78rvih220s3i7li6sujg3rueq7/zodeta.pdfIn PDF document text
    • http://djpress.pl/Image/files/ketopafokuxelalezenixi.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/1c43fcbbc66720af2153d12ec699f387/weloputozagivujeguvo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=citroen+traction+avant+service+manualPDF 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_off0000db66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB66 19128 bytes
SHA-256: 7f602ba6e5b199efb3a6919fa5cb42429e60cce0ba6fb7cdbbb5f52efe084acd
font_01_sfnt_off00010c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B5 10588 bytes
SHA-256: 1d7e5166e9d8faedbcf00bc6a07f3dd49500745df3afcc57b338210076e29a1c