Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd182e64497b4f6b…

MALICIOUS

PDF

84.8 KB Created: 2021-09-17 08:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3e4fae855451ee283dcde396663fc1d2 SHA-1: d18e078eec9f7106c9738eb5409ea26217b817ab SHA-256: dd182e64497b4f6bf64100d148dc7b99f1b44696b4448dfe8b9fed506642188a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://ntct.dz/ckfinder/userfiles/files/zeruvafufexonir.pdf In PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/65579432721.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1086370003.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613667c110c39---76230436059.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/41325002404.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b411c28a1b---41759083730.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/rirunigamapewadoj.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/zarowu.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/waguda.pdfIn PDF document text
    • http://texmet.pl/userimages/file/lusovonudef.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/73866866646.pdfIn PDF document text
    • https://primer-spb.ru/files/files/lusovefoketesalofagofes.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/64317214000.pdfIn PDF document text
    • https://wrd13.com/force/file/tolukozubimunedovezidekis.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/pepomabajaromibu.pdfIn PDF document text
    • https://spacio.hk/attachment/file/8448080574.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/neluvulef.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/35102485553.pdfIn PDF document text
    • http://terfigyelokamera.info/files/file/darijuwaf.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/fabitukipimofitemigete.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/pozunanagotabowokimaxu.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/69567638887.pdfIn PDF document text
    • http://flirdining.com/uploads/files/jusesodumatikukebu.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/87761888640.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/66256617155.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142c352e3e2e---4209426737.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=5+muscle+groupsPDF 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_off0000e728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE728 10396 bytes
SHA-256: da1b53f0a21e133afbc9a90f3c40550861261bce387d2f660a6ae42398100ff8
font_01_sfnt_off0000feae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAE 17904 bytes
SHA-256: 1acf235bad38659045c7f812f980019a658f1f408f6031bd0409ccc5ffc0453f
font_02_sfnt_off00012d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1