Malicious PDF — malware analysis report

Static analysis result for SHA-256 9856cd3111ef3051…

MALICIOUS

PDF

68.5 KB Created: 2021-10-01 08:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 156708087f2778f947496b843641d26c SHA-1: d07c32c3e39436ebd6ada2c2030b9c78488741c9 SHA-256: 9856cd3111ef3051484066240a32bb201315e66638be207eed332e8f675681ca
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it's used to distribute further malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a phishing or malware distribution campaign.

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 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://seteo-dechets.com/images/file/55178196552.pdf In PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/43947017979.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/bulapurexonig.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/wagilikezobokirovut.pdfIn PDF document text
    • https://blugarden.eu/file/51712698374.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/kalukinusegizoxupiz.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/31013407909.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/wisaxasudugepajolik.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/a1eecd0926db592ee0d929c112d58fdf/tubosedurigigopiw.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccb287b394---bunexekumebel.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/tojenizelimugibizusaga.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/65445837514.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/414610807.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/kuzerojanadi.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/nasiz.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/83950402018.pdfIn PDF document text
    • https://luminex.pl/upload/file/bakeze.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/tunemuziduwubapes.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/99530834247.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161500b2e34ce3---70856163713.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/96751189975.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=limbo+2+androidPDF 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_off0000aed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAED2 10184 bytes
SHA-256: 0f26d31e8a2b59c0b2573addac12424f59b4abac9515fc2d52c9bc9585610410
font_01_sfnt_off0000c583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC583 15448 bytes
SHA-256: 82bf331dc2a68ff515f4050d0915d018390f785a5dca12f9f6d5d7027d778f74
font_02_sfnt_off0000ed10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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