Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd441bdb3a3e30d2…

MALICIOUS

PDF

92.2 KB Created: 2021-07-30 09:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bfbee937f401df511369cba73371f39c SHA-1: ec43063c5ad6503ad3667f31ce5ea525ddbc0167 SHA-256: cd441bdb3a3e30d2e5a1f4feb55606e33e102afd3295c5db3fcf1cf6f56967d6
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. These links likely serve as a lure to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/rigozujubogagus.pdf In PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/24c2195607e89be92aab5a673a09621a/67733186757.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/40487460547.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/35952507120.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/e61d5f6ee543baced4760fea1ae3041c/61980078503.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4b90f40f8---zowuwuponifozekaseril.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e7e83698f---99928038129.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/0acd98e157f2824178bb0b3c2ee533a4/mulijonikepogevudag.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f7b0f3898---zelelaliguvad.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c99f646a7---49449106956.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c62e066e17d---71607848597.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/xuxafi.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/85503017700.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/fizufavakipodupafiminek.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/88027120745.pdfIn PDF document text
    • https://zahnersatz.pl/userfiles/files/5690786123.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0ee50598e---5578468020.pdfIn PDF document text
    • http://contentworks.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d7ddcea85d4---bojexokeneva.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609475136656c---temuxeruzikutud.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/012ae745e4c4d6366e1eaf1bad0c6ac1/xeganivewu.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/zipefagapevovekekexu.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/22361098266.pdfIn PDF document text
    • http://euro-ex.net/images/blog//file/65242104873.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/71e7fe928677ba9d7eed1bebb5ea12da/19152268371.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=when+to+use+might+could+should+wouldPDF 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_off000101d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D8 10732 bytes
SHA-256: 221b53a54bcadf964568c6f31dc3330faff0a6dc753caf06c83355e3a8824a84
font_01_sfnt_off00011a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001323c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1323C 18528 bytes
SHA-256: 7c1173f872382c62d52a1f1351e8dd6d0b8a707609daeb96faf1129bd5149c5c

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