Malicious PDF — malware analysis report

Static analysis result for SHA-256 44aa1f2e0421e998…

MALICIOUS

PDF

85.3 KB Created: 2021-09-19 13:10:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 069fb6c5b169dc4cb199040a42cfc79e SHA-1: 4f411d5a2c7f5d1a45a9872741ef5a56350d306e SHA-256: 44aa1f2e0421e998a9ae8643eb60318c49dd16788f1854aae946defb90e72596
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to potentially compromised CMS upload storage. The embedded JavaScript likely serves to execute malicious actions or redirect the user, while the link farm attempts to obscure the final destination. The presence of these elements suggests an attempt to lure the user into clicking malicious links, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9834

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 https://sfasg.jp/js/ckfinder/userfiles/files/47560820155.pdf In PDF document text
    • https://dragonexpressml.com/userfiles/files/topiponitokefa.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/xagaruwavalugusun.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16143509465faa---karizobos.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/65738885225.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161463433d189a---46905534793.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/zudibekasuliworuwolopubo.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/zepipuk.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/35761742536.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/pifuligaxamix.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-13/20210913060118571042.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/diwuzegilidobe.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/jlcs8vcnlmm7041qt6gicr8ru5/70553984737.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/vpb94qk84jujnljnls2ce13pf9/nofidogozemidaditugodobe.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/kewudivezixaketosisovon.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/nurejovakagilipututok.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/4322598495.pdfIn PDF document text
    • http://rc-modeller.se/images/file///suguro.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/keduwujupuvafigi.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/zorabarij.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/rixazawajo.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/11274849153.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/bimigupolet.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/bopukakefumizepigeniwosop.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/50449887413.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/60921158312.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/xivigex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=sword+art+online+alicization+war+of+underworld+season+2+ep+12PDF 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_off0000e0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AB 18944 bytes
SHA-256: 16d6eafb98613df733af28407d53a53555e8a3c44156e9728e30075270975852
font_01_sfnt_off000112ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC5 11104 bytes
SHA-256: 924d2a5ba29d4c86946e1f695f87de08d0e0db7c1cbb947a27c6af7bce779b91

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