Malicious PDF — malware analysis report

Static analysis result for SHA-256 36d057e577f1bb6c…

MALICIOUS

PDF

73.5 KB Created: 2021-10-06 10:30:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c335e1e662bc978254e4bf49ff0f054b SHA-1: 93e75e014352f2816ea993d30992bc57c607567d SHA-256: 36d057e577f1bb6c57ffaa0735c242d996aea24a1b91bde6328f14973f3ab7ff
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 disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://rtquery.reitoken.org/Coaching123/images/files/37456554198.pdf In PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/93056245379.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/tolus.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/73367200669.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20211003205103823.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/40853998415.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/rifaweloleto.pdfIn PDF document text
    • https://kham.vn/userfiles/file/benusufefapaliw.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/21710343742.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/volobini.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/75551634991.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/6qphfuorpq9entr7ag3slg5kl6/lenudowaw.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/63863787622.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/zedexawusuwafupul.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210905022911.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613783a3948fb---41603120259.pdfIn PDF document text
    • http://torgoborud.org/images/file/24630407244.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/bgs7avg5018lk36bg7vgc3fbsk/zenakumozit.pdfIn PDF document text
    • https://sadex.pl/fck/file/65967339901.pdfIn PDF document text
    • http://iknow.pl/files/file/48810849654.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/4396ba988b1273ad90e998115777590d/dulusilari.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/63412419761.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/vamujobol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=princess+and+the+frog+gomoviesPDF 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_off0000b87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB87A 10944 bytes
SHA-256: fbb97ba15a8b010da78e216079cf70b587a959749b8dd836372ab183a8a4c650
font_01_sfnt_off0000d177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD177 17320 bytes
SHA-256: 4a4fcd4f55957e7b630b05e43359b31e22add30406f38155d06303eaea843247
font_02_sfnt_off0000fede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1