Malicious PDF — malware analysis report

Static analysis result for SHA-256 d421b071f89b5d3c…

MALICIOUS

PDF

81.0 KB Created: 2021-09-10 15:24:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3763fdf9ce5040e16d71c720111b61e2 SHA-1: 2d5b51015563a978a1b7cfbc3110f5699d1fcf7f SHA-256: d421b071f89b5d3cad1dfd71ecf7043fef019606d24b3f8259c635e22c1cbdeb
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms or disposable domains. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

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 http://xn--h49al71atridzo.com/userData/board/file/sunedexedugokit.pdf In PDF document text
    • https://helicopterleasingservices.com/userfiles/files/93517702768.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/susejukusesovog.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/57d0d44a5f1e3d4aec10ba5cda1d04d2/lolozebisubiba.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/kavotegijagafipopo.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/vaxitud.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/9765426832.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161380b844561e---fifijidev.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/bariwezolinofizeterew.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/novevesejaxesipaviwitowa.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109091150218311.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/ditejepifikuredebowopuzi.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/metobobujuwikukaxomena.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/kixufivikirisiluxemukiku.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161307bc54ba7d---nitamilemifox.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/29055060488.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/69946286310.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/25861277892.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/bivulod.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/soxogarunasonepej.pdfIn PDF document text
    • https://nasikampung.info/contents/files/66471441345.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/43974539411.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/soluga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=wallpaper+full+hd+androidPDF link annotation
    • https://easyown.ddproperty.com/datas/files/zomubelokaleromufow.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_off0000da09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA09 17052 bytes
SHA-256: b38c38186c08ab59f3cb7676ef0497fbd1143f4cfe986cc50678da8376520c3e
font_01_sfnt_off00010659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10659 10420 bytes
SHA-256: 5cba6fecbc6374bb3a527c6e7ace90a76b00c655e9ea7954ba63b89e6a0eab01
font_02_sfnt_off00011dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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