Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d05edfbea4c9d54…

MALICIOUS

PDF

77.6 KB Created: 2021-08-28 10:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c2be050b6ab1ebe95382b043a9e03fe7 SHA-1: 829e1b8e558594932e26c3ecc9887525648244ab SHA-256: 9d05edfbea4c9d541257fa87fb520219395bfed0f943201043f6cadbbfa389f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a deliberate attempt to create a link farm. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://pistant.ru/uplcv?utm_term=3rd+ave+ale+house PDF link annotation
    • http://vencedor.coop/images/admin/file/vuxibav.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fb9a01e1e90---puwesanisumef.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/lawavaxitepamawulo.pdfIn PDF document text
    • https://capecoralliving.com/media/file/netegikobuzuneti.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/av90fqri9i5tmhkkgu1rr6qm18/fawetipof.pdfIn PDF document text
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/d4f56c3b01e7eb9c7c0c0f8a870699f6/rojesi.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609870c2495c4---wamadosizazirogunugewewer.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/sanexowotugidaf.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/072ec3ff5aa9fcc305893b2270d035b5/zuranuzojaguragawi.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/32a90bcd2b46d5fcb5a6e6169de5102f/95873452408.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d91fc18f27e---demolapowasopif.pdfIn PDF document text
    • https://mimpishio1bet.com/contents//files/lezenetegaza.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/nasupunasuwadatikesimoka.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a9ca344c6---ruwavenabikirojeromi.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/kewofofarojuw.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ifim8g07k30vh4ja8n2evpjjf4/45418382605.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/22885678938.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/50111318187.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/8224835423.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0067ba0e0a---vixaf.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/73017570277.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/21563180387.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/32241761272.pdfIn PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/62983487489.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_off0000cba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA7 17396 bytes
SHA-256: 3b90c0bbd14c86a03cb41468042b8b9e1ba385f0299cf231f2aaa20c11577951
font_01_sfnt_off0000f8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BC 10292 bytes
SHA-256: d6047fcc6fbb038c42bdb424b42f705e88829bcdf6d34aaa24b94a208cab26df

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