Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed5d1f9ed12b10c5…

MALICIOUS

PDF

84.8 KB Created: 2021-09-03 21:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8f47ec13de666d59ad35a62500670cb9 SHA-1: 51183acb2deb231c3e070ec5f83474ee1ec3c87a SHA-256: ed5d1f9ed12b10c5abf7c95cf6a5a5e5a7b280253cd99e3e09cebd0c60833adc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs hosted on compromised or disposable domains, likely for phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crysiq.ru/uplcv?utm_term=calculate+the+vertex+of+a+parabola+using+the+equation+worksheet PDF link annotation
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/bc2c1c4fdc73db54cd09b40d5b4e008f/gedejupapumimofo.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/tiwujusageguxa.pdfIn PDF document text
    • https://carlojans.com/cms/file/2084029609.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/99204410562.pdfIn PDF document text
    • https://educhina.mn/editor/files/95361014448.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa7dee85f5e---xakubipopisire.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbcb9467eb---1295595210.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/46452848334.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/18682410234.pdfIn PDF document text
    • http://manninareunion2012.com/clients/0/03/03b30fdf9aaeeba733afadbef254ff7b/File/20763042379.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/9a7ki3hu4n1eem7alk0295rhgr/15183612608.pdfIn PDF document text
    • https://mauspro.net/upload/files/43111634825.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/587e2d4f0f8711668e3d2d3ab3770fe2/65592226299.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/2269e90de0da714551e1e909f7fa7f99/pulonevopafipefowara.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e123cb5fdc1---87550740176.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cfbbf427e1a---lupotixixukuwemazix.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/osudinireperedewenomuf.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/xikusepuk.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/dolitavojijiv.pdfIn PDF document text
    • http://sterkrade.net/ckfinder/userfiles/files/fijajisaboku.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/93975100811.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0449678941---gapafikutegotibizaxufedu.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/591620987bd1cceea023df3ce53986aa/86596169617.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_off0000e0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D9 19084 bytes
SHA-256: a4e4cdd6ffeccdd57e4f538201d0813dabb694b8b8c64cd2de0c82531b27c33d
font_02_sfnt_off00012a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A23 11524 bytes
SHA-256: f04faf69351d9cc658fe99cb19bf80fc95543af5f19a8c3c4fe7bea803a3e559

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