Malicious PDF — malware analysis report

Static analysis result for SHA-256 4226d2ec83719d3c…

MALICIOUS

PDF

150.5 KB Created: 2021-07-19 07:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3e8249dacf7a8719cb264a919ccd328b SHA-1: 8e594b4155c38fc497e1cc8ec2c8538d70d06838 SHA-256: 4226d2ec83719d3cd8a9755fc8ee7f8fad46c0abca4c8e09d842d4cc5f28b5e2
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites, suggesting an attempt to redirect users to malicious content or download further payloads. The presence of a link farm on disposable hosting further supports a malicious distribution strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851ae1eb3b7---netis.pdf In PDF document text
    • https://gulyaskantin.hu/uploads/frontend/files/soxoka.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160986917137cb---zaguzorefupasedinudowa.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/70946091816.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925267cb384---damaketokotew.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/56749008136.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/42808254940.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/71990560119.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/tikigunav.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3900c0e1e---54704506663.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/4b5c7257c9cfa052aab58655ad378acf/raxabe.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18ce1001aa---tuzukevomamilevimavibolu.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de59380ed1d---fubulamejerulinujasez.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/26399155053.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/jenegoloborujixerusar.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/11f7e34f1306134154a5fa85cd912104/muvoxej.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/10376770696.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/15410756714.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160adb5aec388a---jixesejutezasijixit.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076e43097dc3---72931903351.pdfIn PDF document text
    • https://papiratisk.cz/soubory/42880223412.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/4536095505.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/e18ad2b6ecb323919a84e554a03b9b71/bubamajibabesomakipixasi.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91c7732fb---rifuwanumana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=low+ant+resectionPDF 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_off0001ec2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EC2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00020444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20444 10220 bytes
SHA-256: 5c395b1e83a9c5189f88efeaba179a31edde72177e5a2a777ef2dfb32a14c59d
font_02_sfnt_off00021b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21B65 19504 bytes
SHA-256: b612147feb81e3036b95b4a9f4143a8a06cf8d5c2ed34e72b41d51200f9d6d51

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