Malicious PDF — malware analysis report

Static analysis result for SHA-256 848bf5ca655853ce…

MALICIOUS

PDF

83.2 KB Created: 2021-09-05 23:16:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2037a235ae7ab12e64c047c2d070dc66 SHA-1: 7e2bcc8e72cd15d43e8de25635a78ea33eef9bb3 SHA-256: 848bf5ca655853ce9949a05b7ee95485a051d11df4fac227dc669b7188b852f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The PDF structure itself is indicative of a link farm, designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://allytemp.ru/uplcv?utm_term=manual+gnucash+portugues+pdf PDF link annotation
    • https://thefencedocumentary.ca/adminfiles/file/xevipizeturemozev.pdfIn PDF document text
    • http://fittbike.hu/files/file/31358812478.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/b56127eebf64be20f3eb9289c762dbf0/3014243782.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/11917505836.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082874fc01f9---88711208613.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609808972a379---73187403804.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/43146292831.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/gojararoravaloparuke.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/jrpfjlcp491po5plu4mci3oo8o/82702466689.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/ketibuxofukit.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/61071e3adad51d6ecf2417527807852b/22562964953.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/jixul.pdfIn PDF document text
    • https://zold-kommando.hu/files/48224258147.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/lejuwozovosetawurafodik.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/liwamebabudidojev.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/90386457576.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/6fa63d531197b5b24eba6a098485ac31/wozifusesujolevetovise.pdfIn PDF document text
    • http://abpaluso.com/upload/file/bewamewozar.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/k69nhvg6804h0puksnn841sisc/78195719287.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161001876f3978---59134521821.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab977f730d3---lelenakinenimemar.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/47361597408.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/kewesikikejodunaduki.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/7sa3tn16c74gueu9ill5sjsu9a/77408344987.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/74798386084.pdfIn PDF document text
    • 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_off0000de2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2F 10900 bytes
SHA-256: 04e1193003fd6b0827086dbd45cbdb1c492b40f66ee069e1043a5dee2854e975
font_01_sfnt_off0000f72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3E 17656 bytes
SHA-256: 1de72177c3778badedced1377bdbfe7c3ad672c804d4ec7b8095aa5b9d335350

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