Malicious PDF — malware analysis report

Static analysis result for SHA-256 f06023e30ed31d16…

MALICIOUS

PDF

83.7 KB Created: 2021-07-02 20:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b9518025c179ec40f62002ccbfec596 SHA-1: 8a22259b02acd3aae345201341a84be5804c5a7a SHA-256: f06023e30ed31d16c491da41242e7c60f752e85acae5408e9d1436864eb51b61
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identify it as a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting. The presence of numerous external URIs suggests the PDF's primary function is to redirect users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nomylo.ru/uplcv?utm_term=sq+ft+to+tons
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16083c3364cbeb---27083640226.pdf
    • https://fairtradeportal.pl/userfiles/file/sisidukakub.pdf
    • http://www.deco-interieure.com/userfiles/file/fagowizokav.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0dbdda39d---86256770848.pdf
    • http://atenngo.com/admin/sites/site/documents/51798526117.pdf
    • https://toromecanicorodeo.com/files/xivafu.pdf
    • https://avvocatoboretti.it/file/95222416105.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d64de381acf---9712290.pdf
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210619_29870656A5C90FD5.pdf
    • http://dzbnf.com/upload/file///dixogorif.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/6r2d4tmmd6fj43ng51f98mfbd7/josibiki.pdf
    • http://maslatalaia.com/userfiles/file/58731803497.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/068ea33c9c457cfb105bcc32f8c731d1/gewotekom.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/j5fgssu00r0psv0b0cch1nta7t/9083337369.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/a6cbcej8iajcgpti5t3pida3q6/seramadurati.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607952e802cd5---gemaza.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/4eda167b99d8be6d9f6ac38376709c2c/tenasuger.pdf
    • https://baohohoanglong.com/userfiles/file/74781989108.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b55a53ad216---78533992151.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90fc4667de---40154490356.pdf
    • http://bbu.vn/Images_upload/files/45885069812.pdf
    • https://soudurelauziere.com/upload/editor/file/56367274395.pdf
    • https://deltagroup.bg/uploads/file/bumajiruteza.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da5a993d4b---4207840594.pdf
    • https://nepalipublisher.com/ckfinder/userfiles/files/poxoxegiratipufipezubemik.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e360.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE360 16792 bytes
font_01_sfnt_off0000fb72.bin
c2a81ff8abd8306eaed0539e4c0fa7f9b2b5defaa623d93329f1ff46ff6cbff3
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB72 18768 bytes
font_02_sfnt_off00012c09.bin
becd08a63c07238f3f0ae3f1c9a09b19d912f6cbb194e105e39195d9d87b9f79
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C09 9896 bytes