Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7644cd4a8908df7…

MALICIOUS

PDF

90.5 KB Created: 2021-08-14 07:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: ee28ee00ebc4973f5831b528d58cd839 SHA-1: ef5276eabccb85d55947ef5cd9db7418b831c5e9 SHA-256: b7644cd4a8908df7577d333b73443ef09407af38853fec398cfe4a00bdbb4da1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that exhibits characteristics of a phishing lure, specifically using a fake CAPTCHA to deceive users. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content or further phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://laborke.ru/uplcv?utm_term=ben+10+generator+rex+heroes+united+full+movie+dailymotion PDF link annotation
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/snhmgf976akqoobgukib52a1no/54261969272.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/3648529a24a8b30274002635dcab6822/68296296688.pdfIn PDF document text
    • http://strahyi.ru/images/file/22391786583.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080a808a0ff9---tapurazumewakanufigokeron.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/mexesevixepaxofosifijax.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607698d596e7c---12965516972.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/rudaropafuragavapazigo.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/bopid.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d636c26e7af---velobopuwudolojozofede.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/kenipusoxupuripadoxu.pdfIn PDF document text
    • http://jimmartinfamilyreunion.com/clients/35696/File/79071393638.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210624150115112.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/nrqha0d5v5d278g5379t6fcveb/mubizizu.pdfIn PDF document text
    • http://garderoba.sk/images/_file/80603980268.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/28947878892.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/fagasoguwarozufa.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/29074390597.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a19af5f1a5d---96956356371.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ef1d8f08a---wewekun.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/damasunax.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/10320698196.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769f5233278---javavija.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/459o3gost44ct4658dhobkn0d2/gipijixeburaborolo.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/62het5a2ksbp9ctflpkueebf41/nowixajumelotidomesatix.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/93485435863.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_off0000f8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AF 17516 bytes
SHA-256: 2699fe1cbdac9683ecbb9972510376f62b8adb9e34d29214d3a365b74fcf8ceb
font_01_sfnt_off0001265e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265E 11408 bytes
SHA-256: 7508eb9eb2a4ca674abfa9748d09ff0a853bf1cfb3a1d80735792647107e7de7
font_02_sfnt_off0001410b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1410B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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