Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bb546986161a84e…

MALICIOUS

PDF

82.7 KB Created: 2021-09-04 12:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e481d9bf50e49851268283a4dcb68e9f SHA-1: ca3e08655096a17afd46182c3e00fece86c5aa4e SHA-256: 7bb546986161a84ec01446c6e140193b8d2f7fdce30f26a6431212258e13ba49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://reparationmobile.net/userfiles/file/fejovuwev.pdf In PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/024f51fdbc307811d7daeafd353631ae/laxibegolijitiniboga.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/dilitunolezarinilij.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f8df3943280---jixopejinemeziwutenor.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021061915222537.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/sujagorobozaboguwalesajor.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/837be328020d11d201b8a57cbd7804d5/zoveziloredup.pdfIn PDF document text
    • https://ski-experience-japan.com/images/blog//file/62050136812.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/57600455942.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/99a849obagh0q03tkae2k5e6qh/zubevepa.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed380ab587---148143515.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/dekelinego.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/81d300421e16d9f469512225606b7e6d/53503572773.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/24181614964.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160df1f9ab8825---44781602032.pdfIn PDF document text
    • http://cdio.vn/uploads/userfiles/file/lulesoputo.pdfIn PDF document text
    • https://telenovella-bg.com/files/38858629615.pdfIn PDF document text
    • http://lamdecal.com/Images_upload/files/32540885219.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/56977942119.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/gowaw.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/robuzoxukax.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d43c9127705---lukumasumodafe.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/a49dcfcb5e8bc11155c467a9a3a6f973/80882967259.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=section+6.3+naming+compounds+and+writing+formulas+worksheet+with+answersPDF 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_off0000de82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE82 16276 bytes
SHA-256: faba124bd21c807c1c12931e10f4665e2a406d4fa45cb2169520525f572a1e89
font_01_sfnt_off0001080f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080F 11824 bytes
SHA-256: 80417c6cd2039bd928b1c40bce084a6e7f2eb68257a9910fb1582fb971420786
font_02_sfnt_off00012404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12404 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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