Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdf848578c5f7118…

MALICIOUS

PDF

74.9 KB Created: 2021-09-18 21:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8090550536fdd1918e430dbe4c0635dd SHA-1: 2055834afa7f817c5d2768d34d7f41a49ddc94c8 SHA-256: bdf848578c5f7118369a977893508bc2d597773dce98194fb749bcf5fa84efcf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Multiple heuristics identified it as a link farm, with many external URIs pointing to potentially compromised CMS uploads or disposable hosting. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it is designed to redirect users to malicious websites, likely for phishing or to facilitate the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • 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 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://asiarsolutions.com/userfiles/file/nexobikak.pdf In PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/xulukazewoti.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/dukedawixajamazolelonexag.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/25542816740.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/20939599581.pdfIn PDF document text
    • http://huefpdf.org/upload/file/dobibipebemamojabidasura.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161331c2a21667---lugukegifelolipowudutunax.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/nokotujo.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/07fc1c0aaca5768eacc9096607ad7aa0/taponajefarutudedusek.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/xijipifigewitefusex.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/29f06b36557aba81a82012f37406259d/83649075906.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/zexar.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/pumomufidixowiz.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/91629524205.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/borejubefefuj.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/27180769265.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/10713675302.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/91251558561.pdfIn PDF document text
    • http://ailizia.com/userfiles/17003316217.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/misiwes.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109070234381800.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/ligapogom.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/129e6102737248071cad6575806fedbc/45808384436.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/82828350646.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/b33931b3b36ff94ab3485dc4798263c6/towelij.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/rapamin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=text+from+a+different+number+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_off0000c279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC279 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8B 16532 bytes
SHA-256: 99c2961136a1b85c1c00fb1964dc5f6aebb6ca5d42619d8f4d1c07c2ddc752b3
font_02_sfnt_off00010577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10577 10608 bytes
SHA-256: 915fb625db9dad864a516c5ef1e60635a8f20ff8b688d62411bd11b69db07995

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