Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4949b30d40c2ad3…

MALICIOUS

PDF

86.2 KB Created: 2021-09-14 08:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 50f68423097510f5253767dedb0c0811 SHA-1: bcc50fbae4b18a2c3ef3bedda370743daccc0ec9 SHA-256: f4949b30d40c2ad301b3e08b80d039e5e94b8f3fc5b0a620648e071ffe69c33a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised websites or disposable domains, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing analysis of its direct content, but the heuristics and URLs strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://drafthe.ru/uplcv?utm_term=how+to+stop+unfortunately+app+has+stopped PDF link annotation
    • http://mobiliteit.nu/files/wimikunonosadujokasilopa.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/xetixepobalorifapabo.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/961efad9c4c10bdf7ee46ac03c749ce3/66792606027.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/kuposazamokaxi.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090417173175.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/69456644521.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/tamikujewowi.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/53780707273.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/ginepozebez.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f484520a7d---37559992502.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/bidujumowuroxubevibun.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/57528317212.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/xanigodivalaguref.pdfIn PDF document text
    • http://metabolit.ru/files/file/gofinipol.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/31796724308.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/067fc12bf34f4e412627d310bbc7646c/dupijugisabejetud.pdfIn PDF document text
    • https://sibconsulting.com/contents/files/pamaxo.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/31897487305.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/vikuxewa.pdfIn PDF document text
    • https://onlinendttraining.com/files/bekovoxadef.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/99483441089.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/revowomizifowawivaxave.pdfIn PDF document text
    • http://infosierra.es/images/editor/lujotemixopanofujakorux.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210914_015938.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/98696426754.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/jobenovotix.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA69 18260 bytes
SHA-256: b534c0d6d3c2bc9fe9ac208296080017db954d69625201f89a5c663c73e88a20
font_01_sfnt_off000119bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BC 10796 bytes
SHA-256: 1bb0595a579f1fc429b57eea68cae7c80766e002d912dc54db959460b945c388
font_02_sfnt_off000132a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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