Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f3836585aa7dd3c…

MALICIOUS

PDF

91.6 KB Created: 2021-07-15 15:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b2613289f7dc54436ee2e73a7485c816 SHA-1: fe2e4b7049e39eb51ca0716cf948ccbfe5a8b383 SHA-256: 7f3836585aa7dd3cba715e9f02b395ffcb34e8fb6cf1a87bdb3d8b1417496bc3
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to other PDFs hosted on compromised websites or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 http://htk2.altrodesign.eu/ckfinder/userfiles/files/pipatoxiburidebavusuw.pdf In PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/rakokakowemisoxa.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/lemipewikekalovajulegod.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/nawubojewalijelifuwezaza.pdfIn PDF document text
    • http://fittbike.hu/files/file/11789580826.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/mbbqa0llqg0o2smek98fgq442u/watuwekisibo.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/23989d0109589b34cc6ef56a060ef069/giligupikuvajikomifib.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b43bd69abb5---sugimazuzepikira.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e9689656011---jomiganisurupig.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/52863951378.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/kelexapevet.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/25731668010.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19576265f0---99676993178.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/84528471013.pdfIn PDF document text
    • http://poiskvod.ru/images/file/wukeguv.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/zaxakezawuxibulojivugazim.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/4jjpgvj2jnkjd3vnqc7im6fi77/xoravipodomuzete.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/38243109223.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/daxedekogadode.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/44496685737.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/fnjf5pfkqhh3p7uvfhohs5dsdm/kitafibilatobupo.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/ef75dfabf54da4975cdf7d600d34963f/68716672886.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/27foamp2gm1lgp8f98cu752ph1/wubasapazimadorokab.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-25/20210525204252221408.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/1474631219.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/fa8cdef75204d2eb122deb201e7764db/vekegugofirefeg.pdfIn PDF document text
    • http://china-miyaco.com/img/file/2021621221351.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=three+meters+above+the+sky+3PDF 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_off0000f69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69B 10680 bytes
SHA-256: 02881000537e524800ae63e3778c15ede0d77b8172b16acef6ed257a1c3c14f7
font_01_sfnt_off00010f44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12756 22124 bytes
SHA-256: 72920f6535affef6cd292f9ec51d5a3867d432570a95d7513fd13db13b1323e0

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