Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd1b2459f03c6445…

MALICIOUS

PDF

87.8 KB Created: 2021-07-04 13:12:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bff8c21d6fabe07fa9332f9a3497bdd9 SHA-1: 45c63b5d26d83018c464b2c7871a6c9597677e50 SHA-256: bd1b2459f03c6445817562fb4298b30ea519431d901f0627ec722bedf7fafe7e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution attempt. The heuristic 'SE_INVOICE_LURE' indicates the document's content is designed to deceive users into clicking these links, likely for financial gain or to download a malicious payload. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://irlanc.ru/uplcv?utm_term=present+value+of+residual+value PDF link annotation
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/5d42495727360d8268bb7df6824b98a6/98629855357.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/44uhkhljfj0ia0te8r3g9l1edl/katibovuri.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/jikexuzubudasas.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/7d7511aa1e99bb268f9e8d00abfbd6b8/50535051900.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba59ee008---ramut.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/13270997713.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/ee33049d445a12b900814b71f75b2868/misorujutufafo.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160cc8ec173718---nafofatudegokisadinimupag.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/7fn44shtbuf39o6jg3id3b9avj/rozubo.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/26694204188.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/01af03f753f5f886eb2417ed85f78169/66209025719.pdfIn PDF document text
    • https://activepymes.com/pub/file/nosapuzixaguganat.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/lezexiwijijesoxosixu.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16076986915e58---pebopadesajetogosir.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d35dfcda6ac---23426565797.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc884286f1---5331620798.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/bewawilepuzafititalefodu.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef69314dd8---8819437222.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/nobexawexuxotovozubosirom.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d99e8f6db1b---2240754452.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/7567282154bff23bb8861a067c6e1ec2/bazubezodegix.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7109ac85d---53833279339.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/58573050348.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/3951959301.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/dawasexexurine.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/bac1a75efb888cd091dcb985c2bdae99/zuzijurujorexexibakowexa.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_off0000f45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45E 10516 bytes
SHA-256: 4c02b1cb3efa9dc1a1ab28d8c3b3f08c8f27923a10f535981c27b168a6b63861
font_01_sfnt_off00010c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C73 17212 bytes
SHA-256: cd9663b8e464225b52694596f7cc8901d1143695fee8ea808314d2d1bfd7fdce
font_02_sfnt_off000139bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1