Malicious PDF — malware analysis report

Static analysis result for SHA-256 f53012cfdb1df355…

MALICIOUS

PDF

99.9 KB Created: 2021-08-23 10:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 32388617c14bd30f0cf42c9408d27b3b SHA-1: 1ce02f0fbd9467abf942c85ad81e4f099c9e768a SHA-256: f53012cfdb1df35540ba435ac6def30f99c53c34f32286bb7dd917772c3b1fe0
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=pop+o+matic+trouble+rules PDF link annotation
    • http://savalis.ru/userfiles/file/55399818167.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/91815335172.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/adfc1c43140773c2a924bb0d67210bf9/zavuzosagusizitekodiwipo.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083a89fab133---patadivinofededoj.pdfIn PDF document text
    • http://aiken7050.com/clients/5/51/510ae66c864a6d23552e02d1b5190e2c/File/67664985385.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/ruwafilufuwed.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/26653644318.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/52c79rp775sopo8v68klukdoh0/setekuxekixofajuditapaki.pdfIn PDF document text
    • https://dhesient.com/media/narab.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/25ngii55oleu1to6qnnqf1va3l/50841306939.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c995f5c4fd---fitugokikob.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/c9c269bb3d27228363fe69c9988c8992/74194831122.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/89246268583.pdfIn PDF document text
    • http://whatdwellswithin.com/file/30892881896.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/jemofazizuruku.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/munudewajev.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1608d377f7157e---mirazuwinolivakavadopufox.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e420bd83c3f---rejiwimuwelaxebizebemeg.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/sagabewopezokawatelaxawu.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/fc20ec40d6de48508834a261e72e05d2/bupijovunonozokujoti.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609425727ad42---sigajusudigo.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/0c6abish9r3d6c80dorpqefuf1/68077902653.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a0896a364---kesizaxadexuxu.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/0b01170244a05053cc3db310f0e788d2/63880700328.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/a124f4c9b87c630b4234d89d1432baa4/xowenorunadidevikud.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010be8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE8 10672 bytes
SHA-256: 19cf6697be35dcb16f3ec156c3f3deda98b82deaf9eb3e805dfc04d7e1966fb4
font_01_sfnt_off00012436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12436 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C47 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_03_sfnt_off00015188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15188 17836 bytes
SHA-256: 54c7b216f4b29b834136814c5dda9a6e5730c1acc539668e1b42b43762146856

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