Malicious PDF — malware analysis report

Static analysis result for SHA-256 838d5f4a8b1fcaaa…

MALICIOUS

PDF

79.7 KB Created: 2021-09-10 12:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6e0042257e75694fd8818b9e4ad4562a SHA-1: 3f663b3f68e87c1b66931cbac62f54121cf5fcc8 SHA-256: 838d5f4a8b1fcaaad2371155c5221d80d4f795b304e0255757682971a1522d61
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also features a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute malicious files or redirect users to phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://bestrecycledautoparts.net/images_i/file/turixuruxawupenatalegup.pdf In PDF document text
    • http://majorpropertygroup.com/userfiles/files/60396183673.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396df80d463---81982850342.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/luvativa.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16130e56663bb4---tufuwe.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/96506815888.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/52151000650.pdfIn PDF document text
    • http://englishkan.net/UserFiles/File/83314836819.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/pavos.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/68574326835.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/56742286343.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/podililukupubedod.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/lemawale.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/h8iefuct6mml48tsrm87oc18o5/lozibexaxawaziwaragowinu.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/c0ee833dcb467240acc7132195840466/78368740673.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/safoxuv.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/88399566265.pdfIn PDF document text
    • http://etre-belle.su/images/file/xukuxiv.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/14587921002.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/gumivisadawiberujuja.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/jikirekodiwesaja.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/13408965417.pdfIn PDF document text
    • http://kgmda.com/upload/files/73303283291.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=battery+test+android+codePDF 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_off0000d33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33A 17616 bytes
SHA-256: 76d69e375e0bfaf9030e77e3d34e466f9a2fc730954c465924a81d14572d50b7
font_01_sfnt_off00010112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10112 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11929 10484 bytes
SHA-256: 68ef6438b36d1f58798b68f8e7c8552a5d3695d0d984acbb0ea308a75510b959