Malicious PDF — malware analysis report

Static analysis result for SHA-256 473ebabcf1f139c2…

MALICIOUS

PDF

84.8 KB Created: 2021-09-16 14:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8a3dd5aad4a1248cd5a6ab5d221506f8 SHA-1: 71ba089cb6807586f60e63c17c364c4d9c2fc089 SHA-256: 473ebabcf1f139c2b4fdc538f499c64394fbe802647d651f0d7914c1770ab6e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://viktorina.ledoritulys.lt/files/34915201908.pdf In PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411b549690e---67465076735.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/fubumorefosir.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/58394388543.pdfIn PDF document text
    • https://kopari.hu/files/file/60602460122.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/3098078810.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/75921291220.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/58847023752.pdfIn PDF document text
    • http://agro-partner.com/Image/files/nefefifijotaju.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/59284539242.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/e270e69d09df1efe8569860a9d83b45b/zesobifevo.pdfIn PDF document text
    • http://radiopoint.cz/userfiles/file/mepezizido.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/44634415450.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/rojifexafozoxu.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/65105494531.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/daledofapakabajug.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/wejudexofunulerilugelava.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/82998216388.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/nemokemexelekokufigevu.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/1a2bf0bc712fb9dbb4b88788c7d840db/33426477608.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/jigapuxekijowawul.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/luxaduwikupigugogikoz.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/n9tchgo17d3do9bers186l11dd/pakixetigujiditibawalife.pdfIn PDF document text
    • https://theurbanthinktank.com/files/gilutobufijozatixopugut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=mi+11+lite+benchmarkPDF 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_off0000e20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20A 19840 bytes
SHA-256: f648197e3f20b68b2d6d22c0ec0b59630ccaab9f9a6ddb0c429a248197cd6a12
font_01_sfnt_off000115f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F6 10484 bytes
SHA-256: e41ff8cd7b272a4134c4ef29c0f9874adc093f237ec70bd1d686194425c7ec67
font_02_sfnt_off00012d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1