Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a6fb2fdf822caa1…

MALICIOUS

PDF

69.2 KB Created: 2021-09-29 00:29:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6d893c5984e0b87cb44598544b0049ce SHA-1: bfe025e1b0fd8934579ecc29dd558e18d284cd74 SHA-256: 4a6fb2fdf822caa1716e156777058784dfff73c51a460809615b657eeb94fb80
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable actions. It contains numerous links to potentially compromised websites, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing campaign aiming to deliver a payload or redirect to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://crysiq.ru/uplcv?utm_term=play+pokemon+fire+red+on+android PDF link annotation
    • http://dolekkoyum.com/admin/UserFiles/file/87281606714.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613159a9ab693---74153729866.pdfIn PDF document text
    • http://radecznica.pl/userfiles/file/nolodekog.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/161370b44e3612---49082812866.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/vowevogujumupazubomuno.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/70936126464.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/wutulegusel.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/pedugutalarezisugerajel.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/wenupikokilepoduki.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/71591270047.pdfIn PDF document text
    • http://jyy.jp/ckfinder/userfiles/files/20210921_150639.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c0ca8862b---veturefunob.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/96605426967.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/xemolefuxiba.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/37504754042.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210918_164344.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/pekagefikeborenuxaguw.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/zelegepuwulewowej.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/36425725020.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/28255095762.pdfIn PDF document text
    • https://angkagenap.com/contents/files/81314195939.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/837068448612f03c238214.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/kazimesopopatito.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/tubas.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_off0000b317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB317 14152 bytes
SHA-256: 2bec5499e91de85fe52ef5fa240d435ad8ce6f61208cccc4bc5b22ebdda2a111
font_01_sfnt_off0000d699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD699 10600 bytes
SHA-256: 0a6869d600c320456c4d37310e6f4513ab1f8daa99aae70c61fbbc0955a934b8
font_02_sfnt_off0000eec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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