Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cd5191df5be169c…

MALICIOUS

PDF

92.4 KB Created: 2021-07-23 16:37:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 8bc682bef9d24f48e60e8555fd963885 SHA-1: a4914ee323b8d5fd1297477cb86f46ab551d623d SHA-256: 1cd5191df5be169c362107f76438e86e3698e5ac10b36fe76ca8813c09739cd8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting domains. The primary purpose appears to be SEO manipulation or directing users to potentially malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://ibiforstarlight.ca/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/sunuxugobagotove.pdf In PDF document text
    • http://bannermaul.com/userData/board/file/gikowinopavemosij.pdfIn PDF document text
    • http://satbietthu.com/luutru/files/28410338678.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/16f770097529fdaa05f52a0ead8d4ea1/88352076372.pdfIn PDF document text
    • http://thaide.org/userfiles/file/18321580093.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebbe287466---lanuvuvabibuzi.pdfIn PDF document text
    • http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/lelapawizaruweg.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/cafee66bb6e555e44c3155d66e50826a/19961554683.pdfIn PDF document text
    • http://www.moyekolodin.com/files/25721773769.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b43d44c648---pojonujesize.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/12172097747.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/14feuvcvq158pdfk5rm3ufdghk/92030350913.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8464f7d29c9c62043dc41e66dbebd128/lelebugivopogaxamizumeb.pdfIn PDF document text
    • http://24cvety.ru/upload/files/volimog.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/44030487382.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/203c833971f187bc1eb07fcda5b3a4b1/4163384921.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093de1c4b0ff---tufipenuzulijazozaxe.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/mufezonureg.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/233d9ba1261ec90fd789f8e2ca205914/13519071220.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/kikekezifamu.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083f8da08771---jobevije.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/wumutulemolapolivopuvola.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb8e65cebb---85964972851.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=vidmate+app+free+download+old+version+new+2016PDF 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_off0001039c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039C 17472 bytes
SHA-256: 615d873489391c4312b4bd29ec42f8f83d0710625dedc72508bd28fe8dde2143
font_01_sfnt_off0001314d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1314D 11244 bytes
SHA-256: b7f96d0d3f24235941be23e594fbfbfc1c436bf1aea395bc0172da2911594031
font_02_sfnt_off00014bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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