Malicious PDF — malware analysis report

Static analysis result for SHA-256 479aa74a2bace3be…

MALICIOUS

PDF

100.5 KB Created: 2021-09-07 20:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d216669b6da5c73dc30474189dc45a4a SHA-1: 1a32b012f3dd9abe5730f8f91cc907bd6dc83db9 SHA-256: 479aa74a2bace3be0bbf3364e1fec558deeb3d6376e451f3d539d1e73d15870a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://philabc.ru/uplcv?utm_term=application+letters+format+pdf PDF link annotation
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081467906cdb---70025461113.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/si7asev1he7dmo6t3a9s2v79v2/suxosukesapinafunova.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/3413554350.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/76116276019.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/vokokoj.pdfIn PDF document text
    • http://mebco.ru/images/file/tagofonupawusikuvuduri.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf99a667361---vedozenanejarewen.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/358122ac31fc7552b6d0490574e54378/49181990301.pdfIn PDF document text
    • https://domilot.com/uploader/files/71828630285.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/916fab95b96f361aa22a5a6e9c039906/63145397239.pdfIn PDF document text
    • https://tanthuantelecom.com/upload/fck/file/76124937543.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/wisowobefajare.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/mobebomewed.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/bizobuparizojewirena.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/scnqrp4i2dshb5eliioqg2hhg8/26435314527.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160b1467d71f80---fudajafumimedow.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f03050af381---69492542407.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/89837681882.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/bugevaroxifilanofu.pdfIn PDF document text
    • https://spacio.hk/attachment/file/73542128946.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/11335801720.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609da41e86b05---papazituzowadototugibeji.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087bb61ebc4b---65657457933.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_off000122f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F9 10760 bytes
SHA-256: 2e7da2cc524996dc7b6282f71abf8a9e17640a6bb131572d68e565a7c36d2b14
font_01_sfnt_off00013bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC2 18796 bytes
SHA-256: 15d13693615babbc06e1959079d6cd4e8c8567cdb54d0f4ae512e94dd99641d4
font_02_sfnt_off00016c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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