Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dc84fe7b5b0e464…

MALICIOUS

PDF

93.5 KB Created: 2021-07-29 23:37:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 24a6974f5bc93f5d70fc274250039a03 SHA-1: 0dd672bb277f61cf0fa60e75f7885a46870a66c3 SHA-256: 9dc84fe7b5b0e46484086f02b0defe6b389713dd1283f479b732935994e2951b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://krisoc.ru/uplcv?utm_term=pokemon+fire+red+tyrone%27s+unblocked+games PDF link annotation
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/ts6cgstqoacgo2195h4ojpu512/figelumadoz.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b0686d36f---vizinewameradoselasiv.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086da0112d64---simagubuvaradopavugizom.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/88654627355.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160915dfa1637d---sojuwupavobezekaxogera.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/pigovisefan.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b06cebb43a3---dorawomojo.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d9f4ad339af---50840630595.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3b18ecfeb---sakawemolulebenom.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/19b8a16f4fd1f141c363e005a75ed111/kisakaleritudeg.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/wonanumufiwifurugakuzoku.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/famuziduge.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/5aeac4b4402d4f8e37bd1ce0b6e0853a/lupavepeberexarokiw.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdc318a525---xamigovik.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/a84uftpmvo7mhe3dmj1fee37u2/57789446849.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092eda98dd4e---kusib.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cca8371d2---renirekawuwerove.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210624105941958091h7gic.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/kuvinudugibepom.pdfIn PDF document text
    • https://immobilgold.com/file/21044463065.pdfIn PDF document text
    • https://egca.fr/userfiles/file/26812667658.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210723_FD297EF13CC443C4.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/porix.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/53395848627.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/54beacab65e60060575e8a083dfcd575/zebizofof.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080130e4e4cc---namogosesenatezunosodobi.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee31b024656.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/lepozup.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_off0001058f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058F 17960 bytes
SHA-256: 698729db86aac360b7b317420ae965e55ba88b17e70356b6a989e74300d2633f
font_01_sfnt_off00013442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13442 11300 bytes
SHA-256: 63a5cd142fea585004f1562200a367c8e50b37f9425b4a6dd8989b9f5af8f13a
font_02_sfnt_off00014eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1