Malicious PDF — malware analysis report

Static analysis result for SHA-256 4644eb285b57c6df…

MALICIOUS

PDF

69.0 KB Created: 2021-10-04 10:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 46fb57ad518be819e247c1b12b7cedbe SHA-1: b57d39acca10221092c5a3b142e58bb3f924e2c0 SHA-256: 4644eb285b57c6dfb26f1d16ff1525e2bd8906e96a658504716ab9e55a9adfc3
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to various external websites, many of which are hosted on potentially compromised or disposable domains. The embedded URLs suggest a phishing or scam campaign, aiming to lure victims to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=itchiness+in+thighs PDF link annotation
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/18561428682.pdfIn PDF document text
    • http://rc-modeller.se/images/file///junisewenolez.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/bodovoneporamone.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/eddc34.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/25327783702.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/seturimivujap.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbd0a892ef---jaxinesesi.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/26754884507.pdfIn PDF document text
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/48916884572.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/361823228.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/b5984460fb2ab1abd2281e722ede4da6/lutinapa.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/36145282215.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/61093790088.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/12955634397.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16144fcd3cc4b0---92844576452.pdfIn PDF document text
    • https://aneri12.cz/res/file/49792526260.pdfIn PDF document text
    • http://jaqalsports.com/files/file/xujilezukisezevoz.pdfIn PDF document text
    • http://anninh247.info/upload/files/wipovurarakagojel.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/limowezizomemazodulazavon.pdfIn PDF document text
    • http://minhanh.com/files/lobukuvuzagedijalex.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/71132957204.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/62504406451.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161463b1773580---xijigujubesot.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb65d5af56---dujuromotezo.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_off0000b1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D9 10032 bytes
SHA-256: 9fdb06066cd22667ab1cd2ba2a657d5c73236d6a941eee937657daf59d184a0a
font_01_sfnt_off0000c818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC818 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02A 15156 bytes
SHA-256: 984bc76d8ab8ceb35ea93c1a164ed3b8a30fa0ab2f2617053cdf3d8321cecfac

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