Malicious PDF — malware analysis report

Static analysis result for SHA-256 877ae65fee642b7f…

MALICIOUS

PDF

75.4 KB Created: 2021-09-17 16:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 409b43c3c2e2b44382302bc79fae2fc3 SHA-1: 1b5e61fa2ea47a9f883d304424cfa5ed020c65e3 SHA-256: 877ae65fee642b7f427b3c00fbb5b82dce3c7fc21efa573138dcf08f069061d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or redirection mechanism. The primary attack pattern involves directing users to external URLs, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://allytemp.ru/uplcv?utm_term=joe+hisaishi+piano+collection+pdf PDF link annotation
    • http://www.dr.schure.net/ckfinder/userfiles/files/27481129915.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5d36aedc2---61936765499.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140e9c357675---xotivupifig.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/64010849621.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132dfbe3f9c1---96063232016.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/83702861044.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/69558543654.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/12244994513.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/ditenara.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/71808873388.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/2766754564.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/megapesozos.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bf12cb7d1---90426620595.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/13458777384.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d17fae8fb2---pesavekemadopi.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/14759408710.pdfIn PDF document text
    • http://chieucoingason.vn/files/84518432533.pdfIn PDF document text
    • https://kenadong.com/contents/files/watemiletiburukosozajebo.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/wesenadoru.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133e6e081d9f---1611779957.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/39412852476.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/rutodurujefumarepusudime.pdfIn PDF document text
    • https://ms01bet.net/contents/files/xaguvagapus.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210915213420.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_off0000beaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEAF 18828 bytes
SHA-256: 539c30b846320b83307c5b9fb658ea6b15c5047e7170ac11cc7a85cb3a84e99f
font_01_sfnt_off0000efeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEB 10608 bytes
SHA-256: 9c778251ce968ee4b005d4d90867d7b88ea0f8fb3b290ea40604167b138b2f33
font_02_sfnt_off00010827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10827 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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