Malicious PDF — malware analysis report

Static analysis result for SHA-256 4425f473b016a982…

MALICIOUS

PDF

105.3 KB Created: 2021-09-03 14:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 643c9485034014f0012f5cc11201c17a SHA-1: 834c2d62633c402abf71d08d138703a360b24155 SHA-256: 4425f473b016a982317ccbb9b00cfb263106071712c83e6a9ead92f4d4411968
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to domains that are either compromised or appear to be disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the heuristic firings point to a malicious PDF designed to exploit user trust through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • 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://nitexprofi.cz/userfiles/file/98581779017.pdf In PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff4dc8d33b---18250557449.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161218992496bb---rapuzalet.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c48df236b23---31982806118.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0ce96dda56---96017592068.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/28650529918.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f923f7a75bd---24231119952.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/45662611438.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/78749008581.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6899651c57---875924758.pdfIn PDF document text
    • https://4appsoftware.it/file/rosene.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b945255ddad---menoxisa.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/7551247798.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/2599316a431b20eb8c99b3e81ca1456a/fikibabosetef.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site//site/data/files/28782305729.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/varetutojubedorapewev.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e8635e031---pikixojo.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/eud117mpshhvf0ti71r39bu69h/dezisofiwifodoxoti.pdfIn PDF document text
    • http://cabini.it/userfiles/files/lugujopimagekil.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/magibe.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/52732011770.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/18hf113drv65l43l29j6abkb23/latetojinumesevuxowafiju.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/95237680422.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608acf50bffc3---42496006019.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=attendance+management+system+documentation+pdfPDF 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_off00013671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13671 11012 bytes
SHA-256: 5cb96b3cc86dc996ac7d575230444d214d2dfb20e47405183d669db5f1fb858d
font_01_sfnt_off00014fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FE4 18060 bytes
SHA-256: 6de644bb2911a19c85d994119ff234ae59d31f49fe1f6fa3de8515bc57522025
font_02_sfnt_off00017f07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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