Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7b8d6b62a3c669d…

MALICIOUS

PDF

85.4 KB Created: 2021-08-06 05:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f8a141027889143695e04ed3ff1db511 SHA-1: 406ebbf0fbd3b79b7e84fcbaf51dad607024bae9 SHA-256: f7b8d6b62a3c669d421e3452c19020de3f0db53ffc074a91f298e490a1a6cc22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a1794b83ee5---guxojeditudaj.pdf In PDF document text
    • https://dunaweb.co/bg_image/files/sedezobepasazo.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/batewadofigumopesuvej.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/rawubozijepudum.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/jvosmgi8blgqm8badvnu7osbph/peneno.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d498a1c9e5---visikofokupoziw.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b08594918df---zadumiz.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/pororibuzofow.pdfIn PDF document text
    • http://valeneighbors.com/userimages/11114543882.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/8719111738.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/6jfthaujfuoie1b58c8kj9rg64/rexiza.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210621214339_gmlwrt.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/cea08e0404a8d822d3dabb91991da6e0/kovelobazafewedobonepi.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/1301620722.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7f61a50da---16900934129.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/a45e491be3b8da39840848cc5d90dba5/46753126922.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/26b3ec3f8c7dce322dfc2d10d1e2fd50/bivure.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/50b488fcc52fa61269c91af23c56a8c0/60481708603.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ffd7e4bd3---gagun.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bff86ef19---93765296457.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/vojududagej.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608143b660cc7---74298054571.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e638dba787c---xanavelebesiduz.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/38314558163.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=what+is+the+best+free+barcode+generatorPDF 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_off0000e75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75D 18040 bytes
SHA-256: 9f571d97262464a3c230a431255ad7180965f0cc97d07126f66f19ae798b2816
font_01_sfnt_off00011615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11615 10840 bytes
SHA-256: 42e94a73faca3271e520fae774ee9e2305f1fddd304c5af4b7f1d89b283b84b0
font_02_sfnt_off00012ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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