Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e166ef490e8fdec…

MALICIOUS

PDF

75.2 KB Created: 2021-09-03 10:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f41ee235146d54921ca3b9d72eb0425b SHA-1: 9c45951d01e6916a17b5a91c66ebd07641819fd1 SHA-256: 2e166ef490e8fdecea160128f6135ccc45ac6422394830a9e518d9dd9111d08c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content. The PDF structure itself does not contain readable content, suggesting its primary purpose is to host these external links.

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://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/vufumojusamo.pdf In PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d5e4d0061c6---81376366314.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/goteze.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/mulorawalat.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd282e5025c---sopijesore.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/210dc7771c4d83243c42360b5e879d34/20515298901.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/560342353.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/cl92f2fi3k1tpnbk143ve07sjq/wanogazika.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/27173195964.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/28c4c46b2ef9a58d5756935bbe846f4a/lemenosep.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/basax.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/11367745249.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160895d6f58d9c---264956230.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/fulikejubonojolaxudevefip.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aec808b43b---gudakusese.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/sajemilekamugorovozate.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/74183546692.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/2d839842e1e0e4280ac2bad112027f43/faromukevidawim.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/60012860208.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160830c30d2f8d---25526409888.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/10532006083.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/79046881997.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c910802de81---tunorunuwugilimuj.pdfIn PDF document text
    • https://coluer.ir/documents/file/nufopuxinajixizuraj.pdfIn PDF document text
    • http://runo34.ru/attachments/file/xewav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=applying+the+remainder+theorem+matching+worksheet+answersPDF 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_off0000c1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F2 11232 bytes
SHA-256: 7ce2368773a46139e9c10a18aa81e5c54e41db08c13e437d792de7eab8b12b4f
font_01_sfnt_off0000dbf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF6 16636 bytes
SHA-256: 9705d4892be87492e38f4f822a52feb216c166c4fd10d065c660fbd660eabe0b
font_02_sfnt_off000106c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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