Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2713755249e2a80…

MALICIOUS

PDF

62.5 KB Created: 2021-10-02 15:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5e423958f11693cf2019a8d4168c8447 SHA-1: 65add7434d42b008be84943ec4366bf9dc13ea99 SHA-256: f2713755249e2a800e14905d3558bfa17d0a1c5efe3af1ef858dfe3adc909a12
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and exhibits characteristics of a phishing or malware distribution lure. It contains embedded JavaScript, which is often used to obfuscate malicious actions or redirect users. The presence of a link farm pointing to compromised CMS upload storage and disposable hosting suggests an attempt to obscure the final destination and evade detection. The primary goal appears to be directing users to external URLs, likely to download further payloads or harvest credentials.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4315

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.
  • 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
  • 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://floresdeserrezuela.com/aym_image/files/88963125872.pdf In PDF document text
    • http://vaithun.net/upload/files/94373818601.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613108f566598---majoxizusedatur.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/4127523352.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/lozej.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/rewofofu.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/vimigimugewepegezug.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/8793740243.pdfIn PDF document text
    • https://luminex.pl/upload/file/zotidoleketuko.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f99be7efb1---63584846575.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/40142306898.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/29471117771.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/59820133637.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/munejidebalorig.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/gaxekoxewif.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/42840747129.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/kikakewurakogovoxab.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150398bc5bf8---tubes.pdfIn PDF document text
    • http://ctm.it/userfiles/file/podumalamegemobitasobak.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/xirepunifipevekixenexam.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/siduwizalo.pdfIn PDF document text
    • http://mayingiabao.com/upload/files/5354304687.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/jiwiwarovewebotamoferag.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/h620mcl4p6nqsirr2mpuf77nhv/bonazi.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/lazenatapewiku.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/51971293175.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210907021214.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=legend+of+the+phoenix+mobile+game+cheatsPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB388 15720 bytes
SHA-256: 2738a0dbd45eb7acd58570f38aceb8149af1340d2c85f88b6c32378228774350
font_01_sfnt_off0000db50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB50 11168 bytes
SHA-256: eb47cbc5a7be541b79e5f5a0002ab91d57ec7b3ff01d066dfa85bcedc8392e59