Malicious PDF — malware analysis report

Static analysis result for SHA-256 f503d256417bbca4…

MALICIOUS

PDF

84.3 KB Created: 2021-09-02 06:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5bbd0b4e9ea24a25475d18e240ebe6f7 SHA-1: 31b8b88eac30bf02ae0d388270a11a740b67b4ad SHA-256: f503d256417bbca4b9d924d8513c9a3691c828e6c9d99c5adfffa48de0a05069
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to other PDF files, many hosted on compromised CMS upload directories. This suggests a tactic to distribute malicious content or engage in SEO poisoning. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://cpgny.com/userfiles/files/61181828638.pdf In PDF document text
    • https://jaiminsales.com/ckfinder/userfiles/files/nakebaxavedabawusijav.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/s3fcslseau3g7gro7rv80sivuq/70387867435.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/fe5fabde75327dddeb21914235dda6e5/kusavudidatogegoge.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/c5034393570157c5f8c6b4d01ca15ed1/tenoruwotovumaziramamovu.pdfIn PDF document text
    • http://df-2.de/images/daten/file/91963652446.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/44576658228.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d8ea2a119---52177906449.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-7-30/20210730124636328219.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6a58616c5311e47933a60a15470f8996/89650360740.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/68520362105.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/dewopikevonedej.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/vcnc3gihf72tojdu1oe3r0ag7d/47730756621.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/gopas.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/bigomidulot.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/72490168234.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/85222072404.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccff0c1073---nagakutilumedamas.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/59614531014.pdfIn PDF document text
    • http://elitvorota.ru/f/file/selepatu.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609662927d228---juvujogopopufotevenerax.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/miwabexuf.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cb7a256dc---66024183340.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=blackwell+companion+to+natural+theology+pdfPDF 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_off0000e35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35D 17384 bytes
SHA-256: 3a6b6bee471ef268d561c8be7cccfb0897f94e5f407f86d41fad4db9a44e03e0
font_01_sfnt_off0001108b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A2 11344 bytes
SHA-256: 11deb8ef3fbf4a30890eeca2d36c339c34ffbd2bc89e846aefeee4a2b185dc51

Open this report in the interactive analyzer, or submit your own file for analysis.