Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b1847c3389b07b6…

MALICIOUS

PDF

70.3 KB Created: 2021-09-29 08:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b6d43967f395560a01f363d68e74cd5d SHA-1: ec826543da337923824926fcaf68586e4507bdcd SHA-256: 9b1847c3389b07b6f84d1242e1a244d956e491c3ad45c38e584dd187e5be4af4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. Heuristics identified it as a link farm and a callback phishing lure, suggesting the document's purpose is to trick users into contacting a malicious entity. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://boumqueur-edition.com/upload/fckeditor/file/7993246283.pdf In PDF document text
    • https://alkoplast.rs/files/jopodefavolajokisavodi.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/81571873862.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/wasesivobigun.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b5494b6661---87482954833.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/sewitefarozowefudipew.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/pivagupuxipifofolelipa.pdfIn PDF document text
    • http://kodcomputers.ro/2664/uploads/38746385845.pdfIn PDF document text
    • http://beijingteye.com/upload/files/20045121030.pdfIn PDF document text
    • http://sjhtractor.com/d/files/37686520301.pdfIn PDF document text
    • http://wenfengsi.com/wfs/WebFiles/file///2021090706523916.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/tovibalu.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/sitowiferalajo.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132531d50439---45171055796.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/wovobeve.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131624f10542---66346239107.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161411daa0d097---71223965282.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/96317919437.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/32402920290.pdfIn PDF document text
    • https://atlantidegattico.it/file/13331971307.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/welopuruvil.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/73725680708.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/xemiw.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/xaporaloguzitanuvi.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/42666295551.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+make+text+messages+pop+up+on+androidPDF 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_off0000b175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB175 11060 bytes
SHA-256: 1a03c99750a8f3bef9f647e057dc66f3338436fa4d5117e69347cfd6eed27c98
font_01_sfnt_off0000cb02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB02 16168 bytes
SHA-256: 85be3fdeba32b6efe65eb7ab363b354fb7f066b531c535e75225e19947129a4e
font_02_sfnt_off0000f357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF357 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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