Malicious PDF — malware analysis report

Static analysis result for SHA-256 a36d719cb544daf8…

MALICIOUS

PDF

85.9 KB Created: 2021-09-01 16:01:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 14dd248624ce3e9a3f1f2f25f80c1094 SHA-1: f73ca3f7277cc0141eb03efc415b4f498fb6a949 SHA-256: a36d719cb544daf817932a0b77f59011b4542a78f331562e1a608d50ba7aae8d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of link farms and compromised CMS uploads suggests an attempt to disguise malicious destinations and evade detection, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094670868004---jomesoxexepufavejagipa.pdf In PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/tenerafu.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/vozepe.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/4c02c07d0acd65395ae4b46862f55710/59116562578.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/muxabikexunobemipi.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/liralo.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9o3t1c29r4qlbrb84upuec3r53/mojuxalas.pdfIn PDF document text
    • http://enricobarraco.com/files/28480960169.pdfIn PDF document text
    • http://damoorefamilyreunion.com/clients/7/71/71c8bb141a0941b69292984b9770a174/File/dejexofarudebitajitid.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/17368007784.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/37641850265.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/38482125480.pdfIn PDF document text
    • http://glassick.com/userfiles/file/bobubowizigazurajugafa.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/d7f718bcf1f650972c0ff2e8d6e015a6/48084124003.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16087f5296be77---79944541568.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b70c56195b5---37757936505.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/1b17718a774fd04601bf3da436125bad/27686785072.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/xaniromagejagigel.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/xeruperawedufikoxu.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/bexulebixizajupesu.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/14143865157.pdfIn PDF document text
    • http://cnzgks.com/userfiles/file///xezewunexojabamopozawot.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/mesupigepivazovo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=bunker+cost+shippingPDF 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_off0000e88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88D 19056 bytes
SHA-256: 0d4f70c8bf9aba43c876ce0b3cc12093e8f7577b8f0cc0d7bc85e539806611f2
font_01_sfnt_off00011a68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A68 10692 bytes
SHA-256: 596e4928a44ac9a0716fee10d79d471aac61d8980c83c92c7c26948ac1508d35
font_02_sfnt_off000132f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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