Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7aa9afc1b1c0c29…

MALICIOUS

PDF

96.5 KB Created: 2021-08-08 03:38:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 09e99fbbb621a6ba659874ca3af831c9 SHA-1: 46752ce8d501bfe751b344018e3c365436d4092e SHA-256: b7aa9afc1b1c0c2951ba14da16a793cc00f791fef14c2a6d79adc2a94793d65e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites and other domains that appear to be part of a link farm. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of multiple external URIs and link farm heuristics suggests an attempt to redirect users to malicious content, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/torezutisovosibe.pdf In PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160975b89cec3f---kolomonuxowuzarinefax.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083e653ddafc---wutipufe.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/zikevadalopepudoruk.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c124a26683c---94154082089.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/ob8jc5hd6shaic8bnurgsf6kil/dumesidexuzibasuzabunujis.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a566bdd0f---xelowepatufatakogejoze.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/65glnsp6027gphjp823hm4ei1t/muluminut.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/18034179519.pdfIn PDF document text
    • http://nfc.soo.jp/file/bexutosagujotufiratudag.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/sobodovamikaluju.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788b549a717---wosolabaxeperigepivilu.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160908f7214370---kuforarusapujixuzutudezi.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e69e08c423---26121172062.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/30454626467.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/rijafa.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160d6bacd0bc13---sigejil.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/a65b77e7fdc1d82662a37a77df70456e/nafumedewabulumojerijesit.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/loralijavokero.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/a568341f5b94c7cba548d34e55dd4841/zemedowesaxupajadigotibo.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/43763593828.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/70013539486.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/46973580948.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079588eca4c6---13316030445.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090c03994028---94519653420.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b23b19fd7---teriveren.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/35909356479.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+write+goals+and+objectives+for+appraisalPDF 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_off00011293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11293 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAA 11208 bytes
SHA-256: 76c8c695da6c86c4628198c8f31812545f59333dc7c91e19be08d756aa6955d5
font_02_sfnt_off00014496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14496 17404 bytes
SHA-256: 2ae295bf3a31c2642ccf9dbc03ff7e014619dbdf517787d18567341c0dff082e

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