Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7706f963fdb5265…

MALICIOUS

PDF

80.1 KB Created: 2021-09-21 20:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b2bcbb65ec2fc7860c63e6fec45d686f SHA-1: 9fa5fda14bfcba26dad1d086398dba2c457e608a SHA-256: a7706f963fdb52657634a21d453f1064755b3a873bfbcae1f9c3825861d70745
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external links, some pointing to compromised WordPress sites, suggesting it's designed to redirect users to malicious content or download further payloads. The presence of a visual download button further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=redmi+update+android+11 PDF link annotation
    • http://guide-eq.com/userfiles/file/20210915195339_s1nizd.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210906011131.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/13008793130.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/eb5eaf4ca92cda52269ae02785becd04/givudojapajetividuju.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/29756793489.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/19524633866.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/gkav9oeevc1itu7n81vrk9lhrq/40482551809.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/nawevamopoj.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/16c04h6aep3v6ih5unupcdarjp/38548808880.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/zubuleluwat.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/43310663137.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/4606716985.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-8/20210908134242659753.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/49498877115.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/figakexuze.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/94072272849.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109211153472100.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/54165437658.pdfIn PDF document text
    • http://csp.hu/editor_up/66200013164.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/52531280224.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/bibasokakixivi.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/zakevokozusopenakizi.pdfIn PDF document text
    • http://www.rsvpcatering-ar.com/files/imagesfile/bolixarawaru.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_off0000d63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63F 10536 bytes
SHA-256: f886efa351ca143a034d86103ffe273b8d1a6a2f37324e8f3d8bb48d9c8a0be6
font_01_sfnt_off0000ee3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10650 17088 bytes
SHA-256: f457bd2f46a9c764b8c4cf9cbfb43c4ecdce01a451a8e98d9db5dda39fe6f208

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