Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e78cb28ade5f958…

MALICIOUS

PDF

89.2 KB Created: 2021-08-25 19:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c223f6e680df12178ec5ae71cb2d393d SHA-1: 0c3bb7b3ccad41bc3705e473df29e2890a617a79 SHA-256: 9e78cb28ade5f958bc92cdc7fc25085b08cb8200d3a4bc8a11d6af47b46d8ce7
204 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading a secondary payload via the embedded links or a deceptive download button.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://tourister.kr/userfiles/file/zaboronubizivojinitet.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/c8c0b710a91f46f6d2b4cb6a0eff71f9/kuxesufedafif.pdf
    • http://hnc2.com/userfiles/file/35891023041.pdf
    • https://anitacalderon.com/ckfinder/userfiles/files/laderumilure.pdf
    • http://fsoa.cn/userfiles/file/55343881041.pdf
    • https://akapacha.com/userfiles/file/47391666705.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/hag3heelbr2ip6h2cupen2rn75/jusitor.pdf
    • http://ambulanceservice.pl/userfiles/file/66174439446.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c23b609674---14421591729.pdf
    • http://pepinieres-soupe.com/userfiles/file/nepoxo.pdf
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/gafezuxedozanogafakuza.pdf
    • http://parkwaywest1974.com/clients/861606/File/54407697258.pdf
    • http://mirai-kankyo.com/userfiles/files/liwopotapegetofeginab.pdf
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/sufamipekaponemo.pdf
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/c74d633d39bb88c50baf322c5daf4814/nobid.pdf
    • https://bisnismedsos.com/userfiles/file/70321572320.pdf
    • https://ssmavidiyar.com/public/content-images/files/29705677764.pdf
    • https://mashtalkandil.com/userfiles/file/37042679714.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6d4986973---midisepogutodo.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/dsc5ti23rg44vl682b8iqssejn/36226788818.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/je221f1o04idc5tn04m6jg8pb6/pojekazurokoman.pdf
    • http://omgmediatank.com/userfiles/files/68838917033.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/epf2vrmdctsup8ga61ruhm1h1e/xutotanovipipivu.pdf
    • http://qca.ch/userfiles/file/xilukavezi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=oxford+handbook+of+anaesthesia+pdf+free+download
    • 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_off0000f4db.bin
02867b931bec1c1fb58daf328d86109e17294e1aab27406727da20ee2a82877a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DB 17588 bytes
font_01_sfnt_off00012322.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12322 16792 bytes
font_02_sfnt_off00013b39.bin
d51b61cf8cf8f1ba541f4b9a6a82368a3f39cbbf5df28c660f41a0b657fa7712
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B39 11040 bytes