Malicious PDF — malware analysis report

Static analysis result for SHA-256 a15a5dc437df37c7…

MALICIOUS

PDF

74.9 KB Created: 2021-10-12 05:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c9588b6e6174b0a87a54ea11eb1e2802 SHA-1: 5c4d1f3d98d6088e6bb513a689d00503d6b40cfa SHA-256: a15a5dc437df37c773036f3513505c576910caa6dc068f21cb7c2ccd1d8af468
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of external links, many of which are hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://chcial.ru/uplcv?utm_term=rubber+producing+plants PDF link annotation
    • http://bibikid.ru/upload/bagesolerox.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/devun.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa8061b427---pudifepikemevotaj.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f0ae109d6---36439427682.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/vivapejilodudafuw.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/manaxowewelixuk.pdfIn PDF document text
    • https://ms01bet.net/contents/files/popevefobusoka.pdfIn PDF document text
    • http://ocvitlucky.com/vietkiendo/upload/file/63192102313.pdfIn PDF document text
    • https://qud27rxl1-k61l.com/contents/files/zolosibisuzejafigu.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/fubogubofi.pdfIn PDF document text
    • https://ibericadearmerias.com/file/62105457657.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1615e783d9b74c---xibapupopedovajutatav.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615884f045ca7---49466394553.pdfIn PDF document text
    • http://amt-alarmy.pl/userfiles/file/dadodenerigetanolumasita.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/javibosidijofataxanemudun.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/28180138546.pdfIn PDF document text
    • http://ambulatorioveterinariosanfrancesco.com/userfiles/files/48170872065.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/bojugixozelelatakozexejuf.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/50217848579.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/rufamesuvovu.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffcf98d7f6---buvubasikolenep.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_off0000c060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC060 17420 bytes
SHA-256: 97ae786ef4aa235936613ceccd5041c2f55e71bfe291337760e88c9da1a4557a
font_01_sfnt_off0000ed0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0F 10976 bytes
SHA-256: 16bb1c766831f94eeb5cfede9352e6b17b12f8ccbd592221c99812ffd00e7677
font_02_sfnt_off00010633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10633 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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