Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cd5b83309a57bed…

MALICIOUS

PDF

84.0 KB Created: 2021-09-07 16:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 46dd7c580b3857d2d5e0d64654a1ab8b SHA-1: b195832a3a4cb1926297093ad362cc8eebf476b6 SHA-256: 6cd5b83309a57bed6adad33f8a011fc7684efdc23644a78d52998f2cc96ee179
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and other disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO poisoning to drive traffic to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/af8230124dbad24c8244b3295f458fbe/majusesexefebatosawajane.pdf In PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/31690369968.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/bonutejebamirovirux.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/3h2ne01g0cs0bv12bsupvpi2l2/17079339860.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/70239933814.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/tideliguzugogiwo.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9fdb7a4c2---gegega.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/miduwofomizebun.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/00ha8jfu85vve6tfr3nlthnmlp/rewamevogunarozuli.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/wasereto.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c92b7409f03---beduzobagofu.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607f19bf8c17e---budakeboluzisan.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/71277771928.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/0d676cbbaeb163181d2cdbb10e03b9a1/8829124042.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/wilafupapu.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/mojilomarojilelizaga.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/3147202791.pdfIn PDF document text
    • http://18554080.com/userfiles/file/bijigonulobapu.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fee653d6a66---xoxumalijiz.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/m949u4bddh2nl28a49sj4nul21/zurirubosuxanobar.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/61276775185.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/74b1e3eb2c720ae4a99054ccfe8e41de/7319683312.pdfIn PDF document text
    • http://apvn.info/userfiles/file/93295277869.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/kuzeliluparuvuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=wolfenstein+3d+snes+manualPDF 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_off0000d9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BF 21152 bytes
SHA-256: 99659321f1029e324b42e2a7c0c91c70b67490e6533f0718bfac949b96d196ba
font_01_sfnt_off000111dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F3 10680 bytes
SHA-256: 7e9e870ff99348c8df5ead3442a3830d230c007fa4333817b045c1ec18df25b7