Malicious PDF — malware analysis report

Static analysis result for SHA-256 47dc9a5a92241284…

MALICIOUS

PDF

80.0 KB Created: 2021-08-18 08:38:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a2a5babd78fc064c061d773dec7c568c SHA-1: 79b3c0d392e8764cffba0a63b777ef746b117a3c SHA-256: 47dc9a5a9224128488eb62161c5bcc64687d7462873f701e8468e86d8e2c3d6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains. The primary purpose appears to be redirecting users to potentially harmful content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/ouq18i8t4kggssq6hststgplf1/zebaberidi.pdf In PDF document text
    • https://kibledergisi.net/resimler/files/82524668535.pdfIn PDF document text
    • https://ienter.bg/files/6963635658.pdfIn PDF document text
    • https://temahr.hr/files/fobepidirifu.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/22472734230.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/zofujumogu.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/lamegaziw.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/j5uskn5d20dp5d2344639vii27/78844435782.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/jikedesowowofigejosor.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/woruvotutejuzize.pdfIn PDF document text
    • https://t2sc.me/userfiles/88462721375.pdfIn PDF document text
    • http://prosquash.by/data/nuwaxovekekadomonepakupo.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/9b2ccdgblpbk6rgb7o0s78ff1a/guwewelowibowabapuf.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/95263165069.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/49422436984.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/36496186493.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083f507133a6---24411703566.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/zilufuj.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/mesile.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/vomowaxotidukilemugod.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/24f36017460c8fd93a2a9e9bc9b6c4b8/37906195583.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094352d34348---wivapubaranafelu.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/49840523131.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608abb7ff39c9---22709128621.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a263b55e3af---maxawowigorovuwabozapa.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16077fd6f5effa---majazubedirenisun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=f0+error+code+air+conditionerPDF 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_off0000d7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C2 16488 bytes
SHA-256: 8a94515f4057159a5747517b0dd91835ec46846671ef4f510d685b0f6a684a08
font_01_sfnt_off0001024f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A66 10248 bytes
SHA-256: a0329224b61bfd5908d5688d44f68108464c864c7fcd6bb103b39cee23497c8b