Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea61ade513d1aaa8…

MALICIOUS

PDF

71.4 KB Created: 2021-09-22 12:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 11b8aa8162d261d6d3ee1488a3142075 SHA-1: 21263e7dea686b7d2dc3323b865cec9756c99fc5 SHA-256: ea61ade513d1aaa8475aba6c1536e9bc9841e273bedb09f0e8df2b03e3ee09de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ML classifiers and ClamAV. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, forming a link farm. The presence of external URI heuristics and the ML_NYX_PDF_MALICIOUS firing strongly suggest a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing lure, likely intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://drafthe.ru/uplcv?utm_term=samsung+galaxy+note+5+rom PDF link annotation
    • https://winstar-tools.com/UserFiles/editor/file/rusowenapimixo.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9c8727b43---87796769882.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/36948538685.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/71492516934.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/zefopivilonogur.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16142894985edb---79209856525.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/14924470464.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/pevilijefiva.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/totukibovo.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/vuzevosexiwexi.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/zebuzirivo.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109071312333974.pdfIn PDF document text
    • https://temahr.hr/files/86684597297.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/vaxibetekifigipokorimaz.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/85863440772.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/misobawir.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/supasepezerelamev.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/161479843bd0fa---17030086381.pdfIn PDF document text
    • http://www.zaluziemalina.cz/userfiles/file/rezagaliganipakimokeva.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/13871233973.pdfIn PDF document text
    • https://bdata.vn/upload/files/55800695181.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/25050745165.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/74158409394.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/siwonepazowobomuvop.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe9e6e2da5---37325007453.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/zeripunifivuvakomasas.pdfIn PDF document text
    • 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_off0000b6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6FB 15428 bytes
SHA-256: ccfc94cae580b7fc421b75841eba0858ed01e435eba94cf02bdfadd1b34f1e3f
font_01_sfnt_off0000de83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69A 10884 bytes
SHA-256: 395d18a45dd6c4872ab2605654c54bf01310ff212a7ebf2a61bf92bbd6972fdb