Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c985593fddb78b5…

MALICIOUS

PDF

76.9 KB Created: 2021-10-05 14:17:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 724e0d454b4223fe113e12ec40b70648 SHA-1: 9c47d090520198c5181d637475c883da0502cb43 SHA-256: 7c985593fddb78b56f39ac329adb1215d82a12aa72a92e9af5caa169c8e9218e
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains embedded JavaScript and numerous external links. Several heuristics indicate that these links are part of a link farm, potentially leading to compromised websites or disposable hosting, and one specifically points to a compromised WordPress upload directory. The embedded JavaScript and the nature of the links suggest an attempt to redirect users to malicious sites or download further payloads, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://huntic.ru/uplcv?utm_term=who+built+the+first+mechanical+calculator PDF link annotation
    • https://scavilecis.it/userfiles/file/608692612.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/41812522558.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/zekasadafagiruweka.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/dafonekapatenex.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/33916190527.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/21813169471.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/barezasexutibujewimovere.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/17b849fb644623a42cf122863844e767/34067917716.pdfIn PDF document text
    • http://temdientu.vn/images/ckeditor/files/12512940381.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/fudajebidat.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a5ff8b793---rusasemorurubotuxaxusa.pdfIn PDF document text
    • http://alothongtin.com/upload/FCK/file/jifutoxemodudebosunu.pdfIn PDF document text
    • http://ajitcoatings.com/uploads/36118280292.pdfIn PDF document text
    • http://reestr.fgosvo.ru/files/files/kodorizanubakawaxetix.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/37520999122.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/kimukod.pdfIn PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/92603291655.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/20819672280.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/96b0d8ea5fba04329e9f4a20b7b68fc3/75293085385.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/miwozesinivuvugifeje.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/bimozelikufabadalolimad.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/xafodoguzixaf.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/demivenosukozox.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210918072234_au2207.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_off0000c7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A1 10836 bytes
SHA-256: 8c308a62241ca4882ac12c15ff55bfaacef8d5d2148a5eedfc81a0de4ba90884
font_01_sfnt_off0000e077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE077 17860 bytes
SHA-256: 3e83c9b412e53adf0bafabdbfa1163b941a88ad2aecd4822d171b419c3738925
font_02_sfnt_off00010dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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