Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b4653fcdaa93033…

MALICIOUS

PDF

90.8 KB Created: 2021-07-09 07:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3dc2a8ebac4c08cdd9ebf5a11f44782b SHA-1: 0e89a50f3a6ec5153559fdc96cda01748806ad11 SHA-256: 4b4653fcdaa93033c8cf0f56ca02f168ac4108fceaa38ecff48f950e1fc808ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations, likely serving as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, with the URLs suggesting a phishing or scam-related lure. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://crewmak.ru/uplcv?utm_term=vt+and+vf+ecg PDF link annotation
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b14381c7f2a---kobonetukoroxivitevubofat.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/gijisiwezudedizuvow.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbb3195f36---22573429312.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/52310537121.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/nhidtd2fckq84hnqrmda7cn5e1/56679405871.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/2c35a8e72d079dcf1bf74b36438e21f4/28333476472.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872d1c63602---finerodiginumum.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/54bb1e44a6d9ef5bb0ea7cd77bc2106a/8540431621.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/besowinomosidipogimezon.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/sikaj.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/8758414041.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/lotuniv.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/n42nquks10grgbtcog6br0e36a/97703930037.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/j1gd9snq0ikib2gh9cs4lhenmm/kukerazuluzebaxor.pdfIn PDF document text
    • http://artospace.com/pics/file/74049249048.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/teromoligedudadegaliki.pdfIn PDF document text
    • http://xn--h49avwqct32ewe967crscpsaz7d.com/ckupload/files/pumemonuj.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f9131e377---mazelajuvobis.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/fefamoge.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/4ec1d12940223cb69f2b6e8beaa04fec/79137113700.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/69091685969.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/vakunuzupifakejureman.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160781c193b523---25398582293.pdfIn PDF document text
    • https://papiratisk.cz/soubory/15189291691.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/kubapusuvirunedadis.pdfIn PDF document text
    • http://distributoram.com/files/file/papijaje.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_off00010270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10270 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A82 17296 bytes
SHA-256: 285ad63efcd679fbde185d24577800330296b09a95488de332410076c564cf49
font_02_sfnt_off0001477b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1477B 10160 bytes
SHA-256: 7710f3a687e5671c474e5dd6640326923e579ab5d52fa7e602c1d6f96ef78209

Open this report in the interactive analyzer, or submit your own file for analysis.