Malicious PDF — malware analysis report

Static analysis result for SHA-256 8423cd59a783b8fd…

MALICIOUS

PDF

69.0 KB Created: 2021-09-25 02:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 53f239e2e6caca2d60807db3a8a1d15f SHA-1: 79f9a2c4a506a3cface2526993a137d40ffbdabc SHA-256: 8423cd59a783b8fd315bf2745fade729c2307d9ee6e8cde1574784c25500dc43
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious websites. Heuristics suggest the PDF is part of a link farm hosted on compromised CMS uploads and disposable hosting, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://inwebjor.ru/uplcv?utm_term=king%27s+avatar+game+apk PDF link annotation
    • http://kapalishakti.com/ckfinder/userfiles/files/58980489529.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/19761161113.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/0t345o24re87f07lltthlhfil1/fizugivuboxewuruwakaw.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/menasim.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/burujisideluruwoda.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/58e5bteamqvmaf27ccp7m9mko4/lelidiwexurizewevoze.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/deluf.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210917_A004CC58A2D00616.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b5a4e72d39---zekaselexubop.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/e812922dd111b2427a5bc32b2f4497ab/jirigetatebemejamurozire.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/gomikebepedukodezaguba.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/28846640103.pdfIn PDF document text
    • http://traviet36.com/upload/files/3366341797.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/b091971f7b4d1e15f15dd9ba6bfd9dbd/42040424737.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/lutubat.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/gikexomago.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/91799048707.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/tamedawakobuz.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143debd126eb---zirutuzaxorox.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/tubilofimewinaropikuxi.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/funetuwudok.pdfIn PDF document text
    • 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_off0000af45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75C 10612 bytes
SHA-256: df9cf837142abcb1fd350c86b653443393e6db030ba12a281f1cfb76f631c9a2
font_02_sfnt_off0000dfa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA7 15616 bytes
SHA-256: 5ae7eaf193f2f88349fa0565804937393e1819b57cfc614be91e650b387b49e1

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