Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a5a11b7fdcbcb23…

MALICIOUS

PDF

87.8 KB Created: 2021-09-08 20:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 075f314b1a7d3870fbdaa1ceb27be11e SHA-1: b6e749570c502148ca98373e7b2dda52453b6ac8 SHA-256: 2a5a11b7fdcbcb23536b62019bf3a014d4671750b42ca32254b467d4c81ef3fb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/2pslkpsj5lok8dcrobp867nf0c/xavew.pdf In PDF document text
    • https://officialbacknumber.com/editor_up/lafewefure.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/fixisetu.pdfIn PDF document text
    • https://pokereshop.cz/data/file/42029019816.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/9988406386.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/94616535652.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/2c2020bf2ea87ad7181035059b513877/pumobunusawoja.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/44312613383.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/76596689181.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/sapuxorixumemunotu.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/49902042407.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/64234811472.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/56415611569.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/pojusenasivojiterewonamil.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322504ca259---17106501621.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/30650657160.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/52187071116.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/88390352420.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/98114655181.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/24893928537.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/vimofij.pdfIn PDF document text
    • https://adium.ru/userfiles/file/nasidupe.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/36201173143.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/35353434294.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/86021898514.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/64484007164.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/14526437768.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=jasper+report+export+pdf+examplePDF 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_off0000f13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13C 18476 bytes
SHA-256: 8f790263fda4cb0cca0d6cb0b908e663b453fdbe49f9ca22ae1bf968f628cc3a
font_01_sfnt_off0001212a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212A 10556 bytes
SHA-256: 4a1c220530c6844b4a8ca8efe0dd080e14f1311dcc9759c412f5ccc5209c4b1d
font_02_sfnt_off00013953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13953 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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