Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d239a897a3c61d…

MALICIOUS

PDF

87.1 KB Created: 2021-08-26 11:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9b4a3cf8a4d2f11bf17e40a64eadf8a3 SHA-1: d46e2c31e40593717ff914c9d3d4d11e42579883 SHA-256: f8d239a897a3c61d9ea821efc20f86eb7a08e6421fbaeb7b078745e8dbc654fb
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm intended to distribute malicious content or manipulate search engine results. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://area34.info/wp-content/plugins/super-forms/uploads/php/files/ag2p693mrmrh9i2q8s8spmdj65/48210666287.pdf In PDF document text
    • https://tecnibat.net/uploads/archivos/12379963580.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/0aa18f795b57b276f60c7b16f098bd40/kigamivezi.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/38038914794.pdfIn PDF document text
    • http://foxadv.net/file/45420119207.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a91b1bb450a---87739881511.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ok7nmr0r0d0a8jkd0tppll9bd7/rabunat.pdfIn PDF document text
    • http://giwajib.com/ckfinder/userfiles/files/71559158576.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/805119c8e901d9c35485eaaf504838d3/89000968821.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/87069276901.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/99311681354.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/61894164348.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/vinesuripopefimalevup.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/wujub.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/5728299832.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/24237938684.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cae56d40f29---wulesa.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612551eedff5c---zakurefojuduwelevaniso.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021051100304694.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/nuzoxumatuxuzujedufepajug.pdfIn PDF document text
    • https://sintasyapi.com/img/userfiles/file/xibixevibilemakulu.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/17016664223.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/30487392665.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2663679432---giwubexamunale.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+does+a+computer+workPDF 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_off0000f19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AD 16840 bytes
SHA-256: d67375597f2f0ce0299a01ce010048915ce10c0449a65f8efd38abdcf1c3f07a
font_02_sfnt_off000135ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135AB 10704 bytes
SHA-256: 17eefac8214b5645a2ac9d8f98b2ad374e82bf294c9afde98b6ea7211f85d083

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