Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a07c695d361302…

MALICIOUS

PDF

70.7 KB Created: 2021-09-29 06:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f795c139bd4e5c34edde56c51c7b4282 SHA-1: 3fe529ae9964eb3a92be82dada86ade4b10f5a64 SHA-256: c5a07c695d3613024e45d9fc0a24cf74836fa81d6ad56b087635820e54a5c442
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, several of which point to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • 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 http://internet-trade.eu/UserFiles/file/bafonerunobile.pdf In PDF document text
    • http://retrolondontees.com/userfiles/file/25370732965.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/kutufomofigixipupesiwi.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021091415365173499.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/mafejelojibol.pdfIn PDF document text
    • https://cantellodetersiviprofessionali.it/uploads/file/12955633698.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/7d2l1ig478qth999o8ef97ejme/87800553459.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/zoxesapavukagopeniwune.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/lawumobagadejebifiso.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161394d3a86e14---zapunolunuvosafesidibifaw.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161449e4359260---bozevusatawewilape.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/85205944744.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/964c6caea47f50fa3ed995217d461a0d/misonuxofujidobekoru.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/folenutoje.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/8606fcef939a411167a3ddc9ef6bf4e3/rugufafupiluvobesalow.pdfIn PDF document text
    • http://zhymwz.com/upfile/file/95824656464.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/p3gl259r2moa9afg2185uebvb3/23022234464.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/kuwex.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109192337347120.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/famebazoletisi.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/dakagalob.pdfIn PDF document text
    • https://path.mn/userfiles/files/kukusikojuxi.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/58896313329.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=free+football+streaming+appsPDF 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_off0000b331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB331 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB43 16224 bytes
SHA-256: babdd8693f07b87de9ba321edcd21d1ad89964f44bb764de64575ba07dcacade
font_02_sfnt_off0000f466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF466 10816 bytes
SHA-256: 78d77bfdcfa0eb39ae2fa2cbc030430befb5d9991e4ba74f22ae95a789b37e35

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