Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5cb0150ecd03e60…

MALICIOUS

PDF

70.9 KB Created: 2021-09-21 02:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b8cf11d39857d5ad4b37ed00f35aeb18 SHA-1: 3b79a32358abb65cb219abe046465ba302c641f7 SHA-256: f5cb0150ecd03e600b51d65db3441e081589e9b616cb7c4f79434ace0a5b6616
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external sites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The presence of a 'link farm' heuristic and a ClamAV detection for 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution attempt. The embedded URL with 'amazon+mobile+delivery+apk' in the UTM term further supports the lure of a fake delivery notification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://evaemlak.com/userfiles/file///zununodopafagividu.pdf In PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/23294054539.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/86053013905.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/vakilawinupi.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/95143595952.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161464c1da90d0---52181899206.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/pulimosubotani.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/67901573477.pdfIn PDF document text
    • http://vititanon.com/user_img/files/sebamewadawatudubederedaf.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390129d7815---pipodepizam.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/47284449211.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/eiriovh48a238trashkrnomkdlidbv5v/womex.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/44031472661.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/wozemuka.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/53980672032.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/82675484656.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/kodegupufogagupavisolez.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/34aab6337b8482d274ef2b214fa9a99c/6591075818.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/masuwifonaluluxo.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109202011392588.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/pitifojutumivozuduger.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/jamirusetalar.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/54567060294.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=amazon+mobile+delivery+apkPDF link annotation
    • https://easyown.ddproperty.com/datas/files/12098563951.pdfIn PDF document text
    • 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_off0000b90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB90A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11C 14484 bytes
SHA-256: 0fb4143c642c5828415ed56eb2749f35b3c15037edf6ab2e3729bba9729b24f1
font_02_sfnt_off0000f57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57E 10740 bytes
SHA-256: fbcc4035b7a343659ff5d713ec2293cccad3ddd50f9a42d1c8fb6e1ed25f0c67