Malicious PDF — malware analysis report

Static analysis result for SHA-256 6617296e7aae25cd…

MALICIOUS

PDF

83.1 KB Created: 2021-09-08 10:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f05dc3d7d8d0bfbe8a3fdedbed5e71f7 SHA-1: 45a9ec89892c5dea4a163f94af97f5a3c5ee108a SHA-256: 6617296e7aae25cd99ef758decb7997b209e625cb62dcec5bca612d01020e351
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple compromised websites hosted on disposable domains, likely to distribute further malware or conduct phishing operations. The presence of numerous external URIs and compromised CMS upload links strongly suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://asirius.su/wp-content/plugins/super-forms/uploads/php/files/8f0ccb8c8604fa7279c924103acdde41/pesotufimoxulig.pdf In PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/ee061767bfc8b9cd8be4e6572f1396d4/vituxexeduzosaruloda.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160813f2b63620---sekogipavuxajogufexen.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/60201662702.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/57954938148.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/nakafimegifamufeze.pdfIn PDF document text
    • http://zzliuxue.com/upfile/file///30731579958.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/kagati.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/8016351900.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/74469a4b65aa14941e821f7b163dbde4/dakalesojemulokinejoguwuj.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/cnuebbpv1it5v2g77pu420449a/mekesoliredojodofosoz.pdfIn PDF document text
    • http://profm.hu/files/file/xikojagefirupixa.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7f5f54d9b---62756717721.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210806015403.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082d007a1acc---xudono.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608016232c973---wosenisuzakibo.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/gikokuxeze.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b15ed125bb3---29074380156.pdfIn PDF document text
    • http://cuacuondaiphuc.com/upload/files/tubetomufumoj.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/98693894190.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/64366689386.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/de286972754d8c928e272ddc53a73641/2849638129.pdfIn PDF document text
    • http://portalkucharski.pl/app/webroot/media/files/pewimigebaruwedufij.pdfIn PDF document text
    • http://www.bash.cl/media/file/jefomowofol.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/95256717634.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/86130498438.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/18025846732.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=brunner+and+suddarth%27s+textbook+of+medical-surgical+nursing+pdfPDF 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_off0000dd51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD51 11620 bytes
SHA-256: 67014d7008880b8191d127e04dc7e2160c73e832863b751749e5587d39e1cc44
font_01_sfnt_off0000f876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF876 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11088 17252 bytes
SHA-256: f7ba4da0ec444c05fe90616e7afcb595960918a524f39cf71ec53c955f6334ae

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