Malicious PDF — malware analysis report

Static analysis result for SHA-256 6726c82422ce6382…

MALICIOUS

PDF

81.8 KB Created: 2021-09-18 05:19:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8a51e13ebcda146553fd21344cd4929f SHA-1: 664046809998fea2b2d919d1ef01f6c8cbdd06e8 SHA-256: 6726c82422ce6382960418f69309d25342d125d7262623ee663428299ca93bd2
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The primary goal appears to be directing users to external, potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://dusunceokulu.net/resimler/files/wojabovuparariperane.pdf In PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/kd4olehemf06hvh7f0tijaqgl9/zovozexegujapirakol.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/sulobunidek.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/41098703127.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/34693123859.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/sufupaguxol.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335867b8ed0---81108009693.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/midafazamozaniwunedarad.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/a33b214cf29fe7985e33d698d02240b7/bimiwimogezajifug.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/givuvovukuvidodenop.pdfIn PDF document text
    • https://betsin.org/userfiles/files/12470607482.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/zutinire.pdfIn PDF document text
    • http://baoveantam.org/upload/files/41868684091.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/4962350772.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/zajiluvirumuxelud.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139e66028b6d---19219460180.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/68885772535.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/57b7c3e3fa54a1143878346d021caa74/95397302499.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/fazinezoxelipaso.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/tofinijukumibutaraso.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/25405147613.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/8762788529.pdfIn PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/guparigobaxogakenefuja.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/makevozapebelumaxitewu.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/54162609928.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/61454636273.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+can+i+turn+off+talkbackPDF 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_off0000db38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB38 17968 bytes
SHA-256: 0743409bc29ede8d6cd4120ecbe87dd29636c8a5089b78818dfb970503163e08
font_01_sfnt_off00010963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10963 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001217a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217A 10440 bytes
SHA-256: be4d61dabe8b3aeb77f759e3ade2d3d5304d50a066da2443534f19e3999f13ac