Malicious PDF — malware analysis report

Static analysis result for SHA-256 7523b7579b0e066e…

MALICIOUS

PDF

94.1 KB Created: 2021-09-08 11:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d373abda09b350e8350ca0177dc1f7c8 SHA-1: 848872264e703be5fce0ab44aba6d0b0c5e5e755 SHA-256: 7523b7579b0e066ef4cbd5a05724dce947b70afcefe16717c064b6708b40aa28
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution, leveraging a link farm disguised as search results.

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=nigerian+banking+industry+overview+2018+pdf PDF link annotation
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a48143d6f94---51176678292.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/22125109945.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/14453916417.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611be5c61a727---mutakoxatunumerine.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/pegegeroneki.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/jelemexuwuzu.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/gufagikiv.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/duregedoranobulepa.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/xuxozufiralupogesiwa.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073b96102ee2---xizename.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/juxirolizetisazi.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137536974c46---bafigurepilazulegeran.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092586008ee2---malimukuzasot.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/ef5fab74791d5adea9e428e4c445f065/25943064264.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/74382800387.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608edeab5b233---podusosodexowu.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081496ad26d6---82279866839.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16079143d64fc5---livijuromon.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/62543231344.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/xonewemifitorobob.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16080ae434e1d1---64019864182.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/lepejarukarunuvi.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/fuzivawuvopolomix.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/rojezudegitawotu.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_off0001055a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055A 11704 bytes
SHA-256: 60e22825b9e445fd0295bd4f31a774ade9ec2bb630ce0bee7136cc9eef61b756
font_01_sfnt_off00012126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12126 18704 bytes
SHA-256: e61578ed169f26533872762dab6c6e0a985efbb74540c211719bb4f84ae8ec6b
font_02_sfnt_off00015224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15224 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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