Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdfbd036eea30153…

MALICIOUS

PDF

73.0 KB Created: 2021-09-26 01:44:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 147b66d0022e34448dc16d3c0a94559b SHA-1: 4749288793f44e08158f45b97d8434855bd88b66 SHA-256: bdfbd036eea3015353242b826b088e790e1c8f0e033ed2b8b4209b1ca053939f
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous PDF documents hosted on compromised WordPress sites. This structure is indicative of a phishing or malware distribution campaign, where the initial PDF serves as a lure to access further malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f8facac653---mazilomufole.pdf In PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/nanokikidagatinofuwiv.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/nivumunozavesod.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/67644500700.pdfIn PDF document text
    • http://ippon.lv/uploads/File/gunewuled.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/1193997967.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/zulovovis.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/74183343567.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/add734c456cf3007a8516e90b8733b89/jamamagujoxebo.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/bezetikuvonapuvotufuwo.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/lawimopisimovavenajibe.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614f84f95baa7---kajepowalumimogafed.pdfIn PDF document text
    • https://enilubricantvn.hoakhanh.vn/uploads/image/files/56487156732.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/gabusafupexos.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/jederuwuzote.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109030701373798.pdfIn PDF document text
    • http://etnorom.hu/pictures/zagimanugati.pdfIn PDF document text
    • http://uniondrygoods.com/fckeditor/userfiles/file/81619813498.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/nuxadebitukujidoxuze.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/5c975ecbd41c6a751951ad1e4332f753/51346330294.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614b6570acf10---34128124251.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/19147379417.pdfIn PDF document text
    • https://jagominum.com/contents/files/18183279746.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/sewuj.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/54244044306.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=picsart+hack+apk+downloadPDF 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_off0000b866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB866 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD078 17808 bytes
SHA-256: f8f0820bd84f3c01315f45edb6a532c96965627cb7388da3184eef0ebb5e5bb3
font_02_sfnt_off0000fe29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE29 10656 bytes
SHA-256: 46a89d4ed0608ecda10c83b70ca2a0fc3865ad0b1d43b1aa98b64e8ef20bdc31