Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5726053b61d04e2…

MALICIOUS

PDF

94.2 KB Created: 2021-09-22 12:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0f2cd6cc9bec616b42cbae6f748ef91c SHA-1: f88cd555248b10eebbcb28f4545ae93f7c2422a3 SHA-256: d5726053b61d04e23952e30d7a771fcb105bcac618cc760d5ff05fb92da8c457
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a link farm and a callback lure, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the presence of numerous external URLs and the 'SE_CALLBACK_LURE' heuristic point to a social engineering attack designed to trick the user into initiating contact.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://smidgel.ru/uplcv?utm_term=hd+cinema+for+firestick PDF link annotation
    • http://camelliafb.com/uploads/files/202109131649023392.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109040045129707.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/kofekuxalinoji.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/454975265.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/berubufotokomepefuxo.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16145bc0c8a0a7---valufem.pdfIn PDF document text
    • https://j26clean.com/upload/files/28050064529.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/85245564763.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/67818988338.pdfIn PDF document text
    • https://hinaweb.com/upload/file/99623749717.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/36251600952.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/3df3ab041079d187884e24e15437bf26/mesaliponogilamuwu.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/dedumapebasilurofan.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/govusepowavabum.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/mezotuxuzogi.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/vedunixax.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/woxivejuda.pdfIn PDF document text
    • http://metall-press.ru/files/wuxezirifilugaron.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/a25664bcea3049edb3428b3658229c58/97400809596.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394fcaa4402---wutirapojatuv.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/5538883943.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/73952517894.pdfIn PDF document text
    • http://attlas.center/userfiles/file/zutivimubexotifodomejajop.pdfIn PDF document text
    • http://linza-market.ru/upload/files/gagemijijiz.pdfIn PDF document text
    • http://aviafond.ru/userfiles/file/vulokowatokufavalodis.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_off00010aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA7 10676 bytes
SHA-256: 8475e70eba584f37ef0ed490858e544879d02832e06a26218c61687f6601bc3d
font_01_sfnt_off00012315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12315 18572 bytes
SHA-256: 3ab3074ba3f7062105d61cab928a3ff08b900f2b4ac04ff98cd27f2006def4aa
font_02_sfnt_off00015357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15357 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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