Malicious PDF — malware analysis report

Static analysis result for SHA-256 e38914db2ed58e4a…

MALICIOUS

PDF

81.9 KB Created: 2021-09-01 22:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f022187257099365b182e3793d50fba5 SHA-1: 63fbe98455cff3eca40634c6f9d0af858a77d88a SHA-256: e38914db2ed58e4a368c394d139f775ddb567feee559865df1e67e79432ebe58
156 Risk Score

Malware Insights

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

The file is a PDF identified by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, with numerous links pointing to compromised CMS uploads and disposable hosting. The ML classifier also flagged it as malicious with high confidence. While no scripts were extracted, the structure and URL patterns suggest an attempt to lure users to malicious or SEO-abused sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/25c182be988736f5fd575561d1e8595b/56840672039.pdf In PDF document text
    • http://sbairs.com/datas/files/30121426248.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210607173404595641.pdfIn PDF document text
    • https://fultoys.com/userfiles/likazabijez.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/2i94eqklv1a611ir745thjhroi/gapekat.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/vidude.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/fizakexojavetamexulukul.pdfIn PDF document text
    • http://cuacuonbinhduong.com/upload/files/neguwuzixin.pdfIn PDF document text
    • http://artattack-concerts.de//files/file/javetab.pdfIn PDF document text
    • http://chlahb.com/uploadfile/2011/new2011617/files/2021/08/20210816060923.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/84717001507.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/lugutamepulupana.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/bb298f55261fb088f30268c187823661/67557317549.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/ui9l8f6mvuutu1u39psu4t2639/68213255089.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608e21c4302e0---valowexajakegododaverero.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094d5374cf88---taxonosaxibaxixewa.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/1084188834.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caae4c6673c---polotexoj.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/kolaxa.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/dum0gjn5p1bj3trgakt5em58fo/46497959960.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161037a3c59f93---waroxuxok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=cetirizine+for+runny+nosePDF 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_off0000dc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC33 10304 bytes
SHA-256: e6da3d97a858d8a030506c81c6245509c754fed97425abd3260bec152632b48a
font_01_sfnt_off0000f3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A9 17884 bytes
SHA-256: b5d882624d34ef9a9106db98c65a35ea0311e4d3f79d1938bffdc6a1ec7adc9c
font_02_sfnt_off000121ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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