Malicious PDF — malware analysis report

Static analysis result for SHA-256 129e33fcf61ade4d…

MALICIOUS

PDF

83.4 KB Created: 2021-09-18 22:33:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: f34a0663d53ab1c5d409917c821d0428 SHA-1: 7a4c0c4baeee01f12db7cdd33b15e6a1deaffb02 SHA-256: 129e33fcf61ade4dc99f3c3f4be4073e7da785a36a1204f3e7e68eaffb0728f2
156 Risk Score

Malware Insights

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

The file was identified as malicious by a ML classifier and ClamAV, detecting it as Pdf.Phishing.Trojan. The PDF contains a link farm with numerous URLs pointing to various domains, including compromised WordPress sites and disposable hosting. These links are likely intended to lure users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://krisoc.ru/uplcv?utm_term=how+root+android+9 PDF link annotation
    • http://gernano.eu/gfx/userfiles/files/72545798211.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/20357041014.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/renelisuzon.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/g0rluppvncdc84dp61j0qr3feh/10648023305.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131725bc5551---gejejekerikegugaxevopu.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210910_41FA851928026481.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/68e554f2f652cb9512bdabc3fb73c290/21243616380.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/12132462791.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/kikagi.pdfIn PDF document text
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/rokajerudakijuvobujozoro.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/86904514200.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/ruxuxabapubumibapibajij.pdfIn PDF document text
    • http://4yoga.by/pics/files/64012819483.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/jiguxawaj.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/sejitid.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/8ql5r6bss9nf797nvd41h8nali/11310153818.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/jewedosupumi.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/69629324898.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/7b0bcd64ea4d8eb2010e0ebf45d1d561/87953501562.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/98505222800.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/nabetofatabipomi.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/lelutusujokulumu.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210911084920.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_off0000e385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE385 17916 bytes
SHA-256: ae456e9af1ece812e57143ab50374d7e66f37863a0e38336c00c5439f2a99b0a
font_01_sfnt_off000111a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A7 10140 bytes
SHA-256: 73b0e84ef37b6ebe508bc971eb1809929e5bb8fabef7a042dd6ff7ecd1b09e82
font_02_sfnt_off00012871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12871 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1