Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d843e3feed75083…

MALICIOUS

PDF

81.8 KB Created: 2021-09-18 07:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7811cb558c2fa7a6e589c847620ba29d SHA-1: b0401758fea78fb08e1130543893c4ee78043b23 SHA-256: 6d843e3feed75083e045e5fd8ac47393b20a06ed150d51fd27e2368207f5d020
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The PDF structure itself is also flagged for containing duplicate objects, a common obfuscation technique. No scripts were extracted, but the presence of numerous URLs and the overall heuristic profile strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://drafthe.ru/uplcv?utm_term=gradle+exclude+transitive+dependency PDF link annotation
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/k6e0e66u21isqv411ghpa278a5/wejusetoxokovifajusoxusu.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/mawobum.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/53518024831.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/illk35sadk7q8ja50hlsc1m5ne/99193023618.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/65729393199.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/betikumanobisoponidaga.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/lifejuxodukisu.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/37014162940.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/24055306811.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161451d417979d---mofeperizofopebopep.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613caee44eb4c---30596100951.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210904_140039.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/62369092077.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/dikuzubijegudobojafuxev.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/gituwogabosov.pdfIn PDF document text
    • https://baglab.pl/galeria/file/45114826150.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/mimaronatajuviz.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/9528737994.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/08/91655176201.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/g53mblf43d4e6sigde78jbehat/62036272924.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/pubezeloxu.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/pegudoxadagevizeg.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/bugoxuxoj.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/83224721898.pdfIn PDF document text
    • http://villkasz.hu/editor_up/10902433769.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/fikixaseb.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_off0000d94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF161 17692 bytes
SHA-256: c1f69143d34cda86ca90d1fe779760d20142cf426102d1e4923a59ce49cbe8a0
font_02_sfnt_off00011fdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDD 10808 bytes
SHA-256: 5076f8e6bcd18f2ebd617030a6a195a84d46297102e791a22e0e40b8466fa78c

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