Malicious PDF — malware analysis report

Static analysis result for SHA-256 612bd8dd2c7fc8a3…

MALICIOUS

PDF

72.0 KB Created: 2021-09-12 19:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 35f3f895deaaff0f368b6ce38a1c6046 SHA-1: 1559978e60a418dab85831d3c85963d46b67c93f SHA-256: 612bd8dd2c7fc8a37506df52e3a1b9647262e2e0b26f153227caf9eda612a8b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous external URLs, several of which point to compromised CMS upload storage, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

Heuristics 6

  • 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 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://condosworld.com/abisol1/userfiles/files/povaxaseganuwunuzu.pdf In PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613349d2b43fa---renukasejowogorarekiwezir.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136b99e9f1af---xobegisemulinidokoti.pdfIn PDF document text
    • http://myatkinsonfamily.com/userimages/88928174909.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/94693610725.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/dujikoreda.pdfIn PDF document text
    • http://bulmarconsult.com/files/74443907417.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/buwesi.pdfIn PDF document text
    • http://workontext.ru/media/file/11564160598.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/85450622672.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/sifavijafiposali.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/86863310172.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/91347744347.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/57674993665.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddb5d7ebef---15349390096.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/86678465412.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/vowapenina.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/34630690559.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/parezebekat.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/22edb6b239c24ce15fc04bb1819a0d06/balizogafisufevije.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/sezuzajifitemele.pdfIn PDF document text
    • http://word.mn/uploads/assets/72748926427.pdfIn PDF document text
    • http://baominhlabors.com/upload/files/39600284235.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/78620973675.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/bomuto.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/xumatux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+turn+pdf+upside+down+and+savePDF 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_off0000b929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB929 10688 bytes
SHA-256: 1a18aa64093976aaf282fb52462330a5d900a9353b62ccb24df53ccf566a921e
font_01_sfnt_off0000d1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D1 15680 bytes
SHA-256: 65fcc1503bce53f21201177addebcb8f952ccb80cfbd4058bb38243cdff3e3dd
font_02_sfnt_off0000f9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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