Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cffa6e28f5779c0…

MALICIOUS

PDF

79.1 KB Created: 2021-09-11 20:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4a50a56b720e635a8abba3b2e1f38cdc SHA-1: 601ab66729d92fed464ebe55dcb8c6ddc87a77db SHA-256: 0cffa6e28f5779c0d22ee30aeb2f61e2938faa99cda128341897c333d6f01dd8
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics indicate the PDF functions as a link farm, directing users to multiple external URLs hosted on potentially compromised websites or disposable domains. The presence of numerous URLs, including those with UTM parameters, suggests an attempt to distribute phishing content or lead users to further malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://nomylo.ru/uplcv?utm_term=btv+gratis+para+android PDF link annotation
    • http://orthopediedelft.eu/files/59610233197.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130b20c5fe40---vetatamiborolemavujod.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af6417a9e0---xogidelopivutaxe.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332cc721805---gufis.pdfIn PDF document text
    • http://hybsch.it/upload/file/diguvupimedenopuja.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/7557e52d03c97103b7a3b82d04b11464/95582807271.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210904145037.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/4516088425.pdfIn PDF document text
    • http://dhf-china.com/d/files/32431170138.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/75174907246.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/gulasepugoxewifofejobubo.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/pinewimetizeragus.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/topanuxakanos.pdfIn PDF document text
    • http://sinostandards.net/upload/files/lamowemukizozemug.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/82142699795.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/zajubiwizolixiwogujafez.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lupovoture.pdfIn PDF document text
    • http://konberdbio.com/upload/files/fogumopalemefevonu.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/juloxekojilusigu.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/ronodipupukakirip.pdfIn PDF document text
    • http://108shiva.com/userfiles/file/In PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jabunitijizufixepaxuzozi.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16134c85a4d7ea---ledosoxurigibagatobesuwik.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/20826359782.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_off0000ca22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA22 19744 bytes
SHA-256: 74db415bc8f7b77f89d99ed07497cbd42e5c099f6a08eda51066810db3aeba40
font_01_sfnt_off0000fdcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCB 10508 bytes
SHA-256: 3074a4ce72d7f6b1c76323cbe03090c91f4aae8af4a022fd5b2b2f619b4353b3
font_02_sfnt_off000115a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1