Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ac6dcb82e10140…

MALICIOUS

PDF

83.2 KB Created: 2021-09-08 15:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1f03c5b566481d515a416878a849ff73 SHA-1: 941dd96c7800abeda062fe50510e2547bd5d9c82 SHA-256: a4ac6dcb82e101405aced141bb83c58579c5177c98f9d63b1e4ad3d4e630b057
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript could be used to further obfuscate the redirection or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mqskin.com/luutru/files/kogalopunukimaxeviw.pdf In PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/28044360366.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/jarawetikepufowuziwif.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/jukebegagifotabaw.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ce987b8f9---36587244171.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/5f4bb7d7979855dc1dc5d0e835f82b87/67881856146.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/75476336880.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/durunusidomip.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/58236573699.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/kokamomom.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138751d54f38---92276707.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/14q6k9o9s956r7g017btgmtd57/45658186871.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/lilamipufuruvisu.pdfIn PDF document text
    • http://study4student.com/cache/fck_files/file/1427364838.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/nuxusojapetumawaxige.pdfIn PDF document text
    • http://pevak.info/UserFiles/File/guwuzolavuv.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/vowewosawi.pdfIn PDF document text
    • http://iviltra.lt/images/files/38899285421.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/fepoloto.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/mudarikorodofefexesuri.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/debizigagitaga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=jurnal+era+millennial+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_off0000e282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE282 10364 bytes
SHA-256: 013344746fd309b3556e283aeb5e931304a9523a01cd4d39762775ab6542a24c
font_01_sfnt_off0000f9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C3 17896 bytes
SHA-256: 22fcc05df4f16b4c19e3455a9ff9c69965c2e9bbd59d5b44d99a78862e14c458
font_02_sfnt_off00012795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12795 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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