Malicious PDF — malware analysis report

Static analysis result for SHA-256 87ec70879539622e…

MALICIOUS

PDF

87.2 KB Created: 2021-07-05 07:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ac11720d123d92f7da2f8c31a6bc6f3c SHA-1: 4eec20474e94953c2f6077295651973a65cb2274 SHA-256: 87ec70879539622ee4ce18256ee7e3480b664118e429f50e0d3c8d90d82bc132
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous embedded URLs pointing to compromised websites, likely to facilitate phishing attacks or further malware delivery. The document's structure and the presence of many external links suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://synerhu.ru/uplcv?utm_term=red+table+jada+smith PDF link annotation
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcae353364d---momujonetalug.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/49517429408.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e30d9abb4---tumider.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/e70598641fc4f6fa487557b23792b477/14689710502.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087c8c315635---30016172698.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/ht0iiagqo4bckfl3obdkdk6ibh/34264585495.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/vosedojezupena.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/01vjrn2e9a0c4hjmfomqj5e89a/samijikufabexobadajeri.pdfIn PDF document text
    • http://chinalabware.es/d/files/biluxokuserag.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/2240847912.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/502401d69ccfc8ffea421091ae7c69c9/39859847264.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d2b8d6309---29666098504.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/02dd3786b51fccef489f6a6310553daf/51837874208.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe8909b708---niwopobozumukuganu.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/88267390210.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/33877823591.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1621399544.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/52638585664.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8a799470a---nuduvalezolewibitetud.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606d66802f9fb---ruwefijifas.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/82640349179.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/mguscj28cv02a5c7o338a75si5/ruvidazupolib.pdfIn PDF document text
    • http://candientushinko.com/images/file/wogiluxuwotumiboxivo.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cb88a3fd5---62610718241.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f40a9404d---73302128087.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_off0000ece3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE3 10504 bytes
SHA-256: a617ce22451aba7f918e592341ba5a6c0447d5b9c93788f06e143c415dae60cd
font_01_sfnt_off000104b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCB 19384 bytes
SHA-256: 6f117568da98dded86f152515145264750d460d945646d699694acfc7726475c

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