Malicious PDF — malware analysis report

Static analysis result for SHA-256 de0770f0076e7e1d…

MALICIOUS

PDF

78.8 KB Created: 2021-09-08 18:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8e47765b8075600e0b04294357026cf5 SHA-1: 240b92e4737e0bd58f5e3a75abf7480043ed5200 SHA-256: de0770f0076e7e1d68af05d2a345179a049c1f25f5ab0898079020e61feb9112
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest an attempt to lure victims to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://sashtraayurveda.com/ckfinder/userfiles/files/pejilidiperoz.pdf In PDF document text
    • https://lrsdev.com/userfiles/file/mimaxinejukavupo.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161302784d1381---xanusadatolufewesogim.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1630578609.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/55131087590.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/basotekijepiwesedo.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134db6ebb3ee---tobedes.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/92176983865.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/78979423541.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/mapinimufubuwatefiz.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210903_150024_3836.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/57660927772.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/vatigewuv.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/limuk.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/namaduxiba.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/18111271333.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/nerixajufegejuzufomet.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/35817920f960af2590e796b7b1d10c1d/68356079656.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/timusurirebod.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/47592128967.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130d2057712f---84628450841.pdfIn PDF document text
    • http://hillcrestneighborhoods.com/userimages/nulukewogizejebepi.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/fasaxufenazusunoxefekera.pdfIn PDF document text
    • https://sanidom.pl/img/file/97650806923.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=combine+like+terms+worksheetPDF 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_off0000d13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13E 17216 bytes
SHA-256: 5d5d77d14e57ebffc96689c4edc5a291e871f346f450ae34cbac74bd41c0afc2
font_01_sfnt_off0000fd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11588 10560 bytes
SHA-256: 2dc642dcf1c44e79e2ce364483ec860e1b9f799c09aafd085526d3193c0d9756

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