Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c4b7e32b3f3bb2e…

MALICIOUS

PDF

74.7 KB Created: 2021-09-09 19:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 757071aa92db8e8bc64f3b9a70f8b66c SHA-1: 1594c4704ebeb91da024a26f53524a795a2f7aec SHA-256: 6c4b7e32b3f3bb2e7fd729e280b84d02e55fa619d60ec83fb8d7943958168ecf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised or disposable domains, suggesting an attempt to manipulate search engine rankings or redirect users to malicious sites. The PDF structure and embedded links are consistent with phishing or SEO spam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://pincailight.com/zk/UploadFile/file/2021090513380773499.pdf In PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/29028797930.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/puzuwetogexikiwobatetap.pdfIn PDF document text
    • https://uroci-kursove.com/userfiles/file/41950882031.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/81865122391.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139283e12caa.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/janituwatewo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309465ddaaa---pubotelotazi.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/66621202515.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/28219167540.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/vukexijuvoxewez.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/tusumesumixibuw.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/bd15cd6a12afd51f59fd8fd83579704b.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/dojonekapoboxexisesupawi.pdfIn PDF document text
    • https://tour-paris-guide.com/cite_imgs/file/furazuxokozuxewazoj.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/55761280950.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161329d71983ff---39951989080.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/kpvopvmb68fbvcnulebk8un7s6/lidujopisawajazuraxi.pdfIn PDF document text
    • http://topliving.sk/userfiles/file/20334229501.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/demifotital.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/a57ab8c0de144c87e11e5b9a140e3a5e/42126602652.pdfIn PDF document text
    • https://petikdaun.com/contents/files/malerexakevuwupabapolir.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/61718765793.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/rujevovadezojaluwuvelu.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/tobalivenexetebujamepogo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=military+vest+unturned+idPDF link annotation
    • 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_off0000bdaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDAF 10392 bytes
SHA-256: d463584c45e9761cfcbe364edbce664e27d818e14ff442b0614e3364ec6bbdaa
font_01_sfnt_off0000d554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD554 18308 bytes
SHA-256: 48d6113a4f12ff769038f7a8d001e1f591548fa4e3f7f28a88e49f4652d07a6a
font_02_sfnt_off00010556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10556 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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