Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b65ef7bb8fd664d…

MALICIOUS

PDF

78.3 KB Created: 2021-09-03 09:36:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ce2d516dc2ff08c054fc9735aa5e69b6 SHA-1: 3e5836478adf8d3fecb22d5558fdc0f47a1f895a SHA-256: 7b65ef7bb8fd664d13674915c29f01896a683f7380449968cfb70dde75dba58d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as a phishing trojan and ML classifier. It contains numerous links pointing to PDF files hosted on compromised websites, suggesting a link farm for SEO poisoning or phishing. The presence of multiple external URIs and link farms indicates an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://kasargod.net/uploads/file/wepokeborimosixaz.pdf In PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/53sd8tg3rlirdk51bie509c9is/kolugiru.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/72771460796.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da77dd2338d---70047614132.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/velusuvuni.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/tiziwezidaj.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b339df2fa45---gobodojudumolimexetiv.pdfIn PDF document text
    • http://kdekdyjak.cz/data/80734990198.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/e1c65d925c6d2aef08b2e383c40c46d7/3991800810.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/83538398729.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa152ded88d---vumiwinamolalel.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/93679196650.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/salovabibanizefagoxijiwer.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/bc9998d76f4ea262344d305b20506a6e/zokamidokitoxosaxovuvalu.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/xukofuf.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/mm4dj6gv55j6d84qn6ggr5dp7e/xakaregute.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/8592499343.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/23015821097.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792726369e2---84461156017.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210504134747660.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b74d8cf97d---megodivapowes.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/doganabumidigo.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e914a44ac01---74976454639.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/qq7cgfpoh95d3tio7odms03a9j/66561140329.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/kuvurejuniwamowek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=%C3%B6ktem+ba%C5%9Fol+senaryo+kitab%C4%B1+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_off0000c9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C4 11416 bytes
SHA-256: e3b1db2639883a2f0b0aa6f958c5c1fe09d46725fbddca3f73f4856a431585aa
font_02_sfnt_off0000fbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE4 18676 bytes
SHA-256: 57de5473cdf58406d8e7eee89f1bf534976e1d1f6f2d8c75a775e615abedd83b

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