Malicious PDF — malware analysis report

Static analysis result for SHA-256 1522bb05903f1403…

MALICIOUS

PDF

100.3 KB Created: 2021-08-13 17:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 3f37003f4161709fe66164912abfc48c SHA-1: 02eea01c5790c69d19c356b354b9d75c04a0b0cc SHA-256: 1522bb05903f1403365909b497bec1ec53070f0a42e2f6f798ec26613708b698
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, hosting numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to distribute phishing content or malware. The embedded URLs and link farm structure suggest an attempt to lure users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789c02e3ca8---wivun.pdf In PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55ca44e601---nuwovewalemuzudibufag.pdfIn PDF document text
    • http://lbtech.kr/upfile/files/sumenuji.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/88895697773.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/23168776710.pdfIn PDF document text
    • http://mashtalkandil.com/userfiles/file/4329499515.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/e9dacc29a90699c063511a2490fbc862/jubesa.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-20/20210520132231221708.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/55769e448a1da4af9e93ce0f75da9259/fawasujozuwugafaw.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/77268470756.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8ff8761d3---44998329559.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc73ca1f169---66393648137.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/najamotatepo.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/e25c97f96b9c99a3e0eb090df5d071e0/farelulipuv.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/47151614657.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/23984846994.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9f0befa8b---35331523296.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/13rcru9llddjsmj7j3l6jcc4ti/tuvagewiroxibetugotumu.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/68063936151.pdfIn PDF document text
    • http://suara.ru/img/file/jibinapumodek.pdfIn PDF document text
    • http://ourjamesfamilyhistory.com/clients/1/14/146a9f92d0a296c7c29e793db058bb30/File/peleter.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b98dfda8b6---1716955098.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/aq13kq0ee43j315o2kg1ue3dt4/vaxizezolofowura.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/nipoxerejam.pdfIn PDF document text
    • http://panteres.com/files/files/zawodifurukugaginezekakuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=example+of+a+metaphor+in+the+tell+tale+heartPDF 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_off0001256b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256B 10540 bytes
SHA-256: 920cf45d73f2cf0de14f9889366da43f466ab5d8c32db7e9980cc17b2a1c59ea
font_01_sfnt_off00013d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D2C 17408 bytes
SHA-256: 11385beb4aadbabc67614480387b3e0f62864966eb39fcf8bf2ace914c748f07
font_02_sfnt_off00016a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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