Malicious PDF — malware analysis report

Static analysis result for SHA-256 db9cd6eb7282f1d9…

MALICIOUS

PDF

69.8 KB Created: 2021-09-13 15:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b1cce6884e632d6cdffd6212d8cfc8e SHA-1: 53ade8e4ff5cbae759f9afb0344484b328aa3ac2 SHA-256: db9cd6eb7282f1d946d408f783ba59a8a9220112b76110bfdb9fcf1a58165c51
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting an attempt to distribute further malicious content or phish for information. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics reinforces this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://onmamtour.com/FileData/ckfinder/files/20210913_9D48554210D34B87.pdf
    • http://scales-center.com/shop/fck_file/file/74357854615.pdf
    • http://giorgimpianti.com/userfiles/file/88365976193.pdf
    • http://espaciocultivarte.com/ckfinder/userfiles/files/mubabetadexejizolivipi.pdf
    • https://eobliecky.sk/userfiles/file/74415077402.pdf
    • https://perkunasstudio.com/uploads/files/202109060506344843.pdf
    • http://bakefruit.com/uploads/files/202109130612342491.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351388e51b7---80037673838.pdf
    • http://web-news.eu/www/pkpar/userfiles/file/92049187611.pdf
    • https://aglogistics-bo.net/userfiles/file/96812668803.pdf
    • https://kominove-centrum.cz/media/files/file/pixexapewajusitowadidedon.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5622d7264---62223673046.pdf
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/15523898676.pdf
    • http://www.darvidproperty.com/news/file/57249841940.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c243a16ac5---kobebobi.pdf
    • http://kimwendelldesign.com/ckfinder/userfiles/files/geranitoroxetumasuge.pdf
    • http://urs-certification.com/gais/image/file/81454368826.pdf
    • http://shopgraeagle.com/ckeditor/uploads/files/20805332732.pdf
    • https://speculatio.in/userfiles/file/72537752579.pdf
    • https://matrainagycsalados.hu/userfiles/file/tugedudojuputugefif.pdf
    • https://maribon.net/app/webroot/files/userfiles/files/vatadazijufofewapifemel.pdf
    • http://mtegl.wsystem.sk/userfiles/files/wimaviduzogum.pdf
    • http://desiaussies.com/ckeditor/uploads/files/dakexone.pdf
    • http://gleb777.com/fck_upload/file/xawoganavukamowogefado.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/830a9134958a667d91031b4bc707a353/wedaroxebilepuzenojenozaz.pdf
    • http://dealershop.es/camarasegovia/userfiles/file/bidazurerob.pdf
    • https://xedulichhaiphong.vn/images/news/files/77946318087.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=the+escapist+2+free+download+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3cc.bin
6f7c8247eed0c2608fa44b81b2979442061240e65eaf7202e77d2a99ef6bb368
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3CC 14620 bytes
font_01_sfnt_off0000d823.bin
534055679e8c49f33e49ceca30fc6f106a556ba4c84cd71347bb122790cb72da
pdf-font-stream PDF embedded font (sfnt) at offset 0xD823 10884 bytes
font_02_sfnt_off0000f167.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF167 16792 bytes