Malicious PDF — malware analysis report

Static analysis result for SHA-256 5629819d6011fcd4…

MALICIOUS

PDF

90.5 KB Created: 2021-07-15 14:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 34d3f9f3d2387bf4bc46c13e4b8bc3f4 SHA-1: 47a86cc7333673b161ab574618c33c924a221f19 SHA-256: 5629819d6011fcd4e7021703921912369b95a9863d09b22e4898954570e607dd
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or other potentially disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607435aed8d42---39949268520.pdf In PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/5dae3f5072ff84315924bf9225715954/rarekujisafebadagedosalo.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/10510220440.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a57115fa4---78844617347.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c8fe85b95---xuseduduzejebodamagosiw.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/20425248253.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/boduxebitabopen.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/36f95aa3f25e8363a12adb7922b3081c/kuxugudumawilasiti.pdfIn PDF document text
    • http://serenetransformation.com/clients/870552/File/88488729154.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/rojezolalutorud.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/9cid78pc8ruj0jaigmkkj4op94/39524047773.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/14027349752.pdfIn PDF document text
    • http://amandamaitland.com/images/file/62513401751.pdfIn PDF document text
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/39371850266.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b6d3b1ecd---lemakulixulewi.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/dibanixivijefazefebazebeg.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160816866076ea---51963129198.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/plf4gcnl72v479g7okqevbmrb5/lenatufimugarizetop.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/bfeed7268849e99b3f2142ed84bde641/fijemeripofikedabe.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c461cfec773---72628621320.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/j81nbra0f3gjqco0i40bka22ma/20983247000.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/85b9c3065ceecbe731208448c83c3495/limodigu.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/f9spqgta6ln2vek0i240ecjqc6/bedadaxakitetokukowuzup.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/95355768909.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///6015920450.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=therein+lies+the+rub+meaningPDF 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_off0000fd0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0E 10640 bytes
SHA-256: b2f33d3697ba27723fade19f5b7eea86422b0b38e83a1d9ec0b6b2529f69d285
font_01_sfnt_off00011535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11535 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D47 18076 bytes
SHA-256: ca3d3726a442bb854218e01e920161138df4e3af67c95947228ea035b89f0455

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