Malicious PDF — malware analysis report

Static analysis result for SHA-256 f35cf554824fdf07…

MALICIOUS

PDF

88.9 KB Created: 2021-08-08 23:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 140629be2e6c4619c1cd55f998634cce SHA-1: 6fd3feeff6839b43b62b31a8acddfbba60b6b1be SHA-256: f35cf554824fdf07fbb1c26356cb3b4a055c8b56dd57434ff5e5d3f920accefa
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to link farms hosted on compromised CMS uploads, suggesting a phishing or malware distribution scheme. The presence of these link farms, often found in SEO-poisoning attacks, indicates an attempt to lure victims to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c49faaa61---zusigivuzegoj.pdf In PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/fenav.pdfIn PDF document text
    • https://cargotavio.ru/files/file/tefogukumafobinosewigura.pdfIn PDF document text
    • http://temple.mo/userfiles/file/64949808215.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/93578924822.pdfIn PDF document text
    • https://kede.org/userfiles/file/56232319525.pdfIn PDF document text
    • http://top-conversion.ru/ckfinder/userfiles/files/77390604241.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887038ea292---68492082750.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/3nk2ceojnjvg7i5par7pbqkuvc/7834106326.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5c505b503---xajoxonerujifapogiruso.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/jdtl8dg4j5r4ut31t9vjfubeh5/diporutorom.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/24864190420.pdfIn PDF document text
    • http://yfatc.com/userfiles/file/bowufujijimet.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/lavososufe.pdfIn PDF document text
    • http://canadanur.com/resimler/files/gexudamufuvesigulidowur.pdfIn PDF document text
    • https://cakenepal.com/userfiles/file/70106437976.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c3cabbedc---kotenaborofepel.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/86794987075.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/nifimegobivusisuloxezalu.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/depumesodidorexa.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/63400837413.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/0d1827211d1a2cd2dc47fe72490e9551/32008117809.pdfIn PDF document text
    • https://nowtravelasia.com/userfiles/files/soloxeva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=crazy+frog+piano+notes+sheet+music+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_off0000f191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF191 11324 bytes
SHA-256: 3fee0fbfbe6a9d747ff63db516c56f75a8cd905bffac70fdf7d01a66ecd259e9
font_01_sfnt_off00010bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEA 19232 bytes
SHA-256: 0a2f7603c1fadee39c6f5b01c8237ab8fb1685f74618637ca6f84f74605cd244
font_02_sfnt_off00013ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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