Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bba376fc5354009…

MALICIOUS

PDF

128.7 KB Created: 2021-07-16 02:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6f6a71e926c38a2375a3ed43be7c9496 SHA-1: 93e5b34c12bac7858f81bf26a0f4bf62e4415f8a SHA-256: 1bba376fc535400977a157d7bc592c1de1499377725e26df2d053f436512504d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous compromised WordPress upload sites and other domains, likely for phishing or malware distribution. The presence of external URIs and the structure of the PDF suggest it's designed to exploit user trust by leading them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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 https://laborke.ru/uplcv?utm_term=tapping+to+reduce+anxiety PDF link annotation
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d551e6058a5---78204450032.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16091e6525c211---sinarevodux.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/zokorelimadavumafus.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/9908295164.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/8d47gd5rhjrpd7e6epd13muv90/50205401743.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/d2d69957f14f79ebf4e7a21a539db562/70764945458.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/sunoxe.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/fixefawevijademuke.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/40c5f95d131a4b99cb143e0d3e2db572/88606702963.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/80442190657.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7381483f86---32008444466.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/64790454749.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908b6b5eb49---terijijim.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/ravedemeforobewikukuzatu.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/9er3i6nu9qqjtfq0n8a5qoqf1r/99478609254.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/s0epvilatibpmf50l1m2hire7c/gasubopif.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/33935093783.pdfIn PDF document text
    • http://emeraldoutback.com/clients/f/f6/f61299a274fa8fdb0c00f5b1ed511d42/File/makupemegikaninowinu.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/81799033799.pdfIn PDF document text
    • http://foodsafebox.com/ckfinder/userfiles/files/64785645611.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/66253538483.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609812e6e185f---tigemig.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/e3c73d8de382de38dc93889895ecdbd2/10147105424.pdfIn PDF document text
    • http://huiking.cn/uploads/file/240649084022.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/19147141694.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_off00019489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19489 18232 bytes
SHA-256: 47884fdbefa02b161c104336706917552ec6fa07f24952b6187424b5ef618312
font_01_sfnt_off0001c499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C499 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001dcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DCB0 10752 bytes
SHA-256: 1b0454a41571d0cfb2f442c07f30d9d939051ee191991f4b6714e7ac42a2d4f7