Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd17c7c8468109ec…

MALICIOUS

PDF

84.1 KB Created: 2021-07-20 18:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: daf6ef04bb825a5bdbad990e1a8f19d9 SHA-1: 5eb4b3e37b5b926060f46bb89d211f964f15c664 SHA-256: cd17c7c8468109eceab96973711501b394a1305f50f7fdd9926a3d6429f3cd00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on compromised CMS platforms and disposable domains. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://libertyquad72.fr/userfiles/file/17732570789.pdf In PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0069c55ba9183711630dcbe5e70347b9/xamakid.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/b313bf16d5e2f5f0b6a3742a5c42e354/paxixulalusezekow.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/1979860157.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/74942642632.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be50b74e98c---dadaw.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/06/file/202106160016316721.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/4e26ca972c246f5ef6b471436d2905f3/gekawuwivoxoligajug.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/kawenuzab.pdfIn PDF document text
    • https://windsbs.biz/files/file/putanavelekopixumezejasa.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/ch89utjddqkgkgmkqplei04mp3/10874087417.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083de8b883ba---9729070108.pdfIn PDF document text
    • https://campermagazine.tv/public/file/61407015190.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/4qjq6sli4qpm66orlugu143jtg/52740994412.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/mutis.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/4s8tj0nekp5l3ssp98b6ou6cs5/diluji.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/diveluxaberevuzevajidep.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/didofedisiladaresipaw.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a36a87389ea---raselirodesexizo.pdfIn PDF document text
    • http://umiyawoodworks.com/fckdb/userfiles/file/viwanasisojojilarujadof.pdfIn PDF document text
    • https://fuchscars.com/wp-content/plugins/super-forms/uploads/php/files/c46f4b730e762e44296ee1f709a57841/nibubunepovijib.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160720939c50ad---muxujudemunegunawu.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/53830858543.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=2020+tax+calculation+tablesPDF 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_off0000e769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE769 10612 bytes
SHA-256: 5a701c154df5b1820ee0c0557a313c6c1160ae4088e92601ddb5969e406be79d
font_01_sfnt_off0000ffe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE0 16636 bytes
SHA-256: 09c2e641b5a42bc6750965889db8d27ca16cc2465bccf93af63e424a74679c48
font_02_sfnt_off00012b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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