Malicious PDF — malware analysis report

Static analysis result for SHA-256 2227af203f420489…

MALICIOUS

PDF

74.6 KB Created: 2021-09-07 14:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2ae98e33e8b14cb9200d1d2b6301bd52 SHA-1: a95621acbd601893c2d4fa3d1f2eaacd64748d62 SHA-256: 2227af203f420489c1825aa997b642bd832351496916a3621f1636fcac11403f
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs, such as the one hosted on remoteworkerclub.com, are likely intended to deliver further malicious content or lead to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/0e19c6fad6165f656d0cb22b530ac73c/vilanola.pdf In PDF document text
    • http://polletnv.be/uploads/files/dovajejozikexobakexeji.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/dimolunarakebuxakowopeza.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/q5i3l5pkt6pps3aba4jhmauke7/befinitizukuwotazo.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/lipezadikesedamipuf.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/582035726.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/fisenagujawewitekesapu.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ginif.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/4c941c2c20aad4da2998fe667daba25b/webaruwejazaxibozutinovov.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202108270629286652.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ekvrfffh1l3sai9cve0lmufvl5/52320064380.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/bdheosadp5b34gmt3ggpm9cch1/81960782228.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/guramosobaj.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/ri1i6ld9i135211cqkn4rskai4/24114010024.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f725931b4da---sigosakimogalifoxibaxoki.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f19c69c87---20927922701.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/22499012483.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/zugotewopevutetozapir.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///zirati.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797f7590056---36812203020.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/65418654749.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/n977r0kese0pql3o67ms1ceg4k/numiredusekezasubiwaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=agricultural+business+plan+in+nigeria+pdfPDF 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_off0000befe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD710 16484 bytes
SHA-256: 13fb0ffa7d103d85a3f4ce9cfed8665f619ab34cde199b3173670120e445d056
font_02_sfnt_off000101a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A4 10896 bytes
SHA-256: a952ac349c29e7333ef90315330803646680ac0517a07e32b873f96cb749b510

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