Malicious PDF — malware analysis report

Static analysis result for SHA-256 b27132cfd95479fb…

MALICIOUS

PDF

94.3 KB Created: 2021-07-31 09:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b6bd2747a7d747152d076afc229040cf SHA-1: 8fdd25ac761acbc0ad4a969e3082e19b46ea0951 SHA-256: b27132cfd95479fbc2352fd9160d0a81456d390c7f82bf4942e85065898a311f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=antropologia+culturale+fabio+dei+2016+pdf PDF link annotation
    • https://advantagelic.com/singhania/downloads/file/32585771915.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/75635845083.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/dc1769cd738b1c4baf0020ceb0c8008c/kegajorolekoferujuv.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/849569a17a51c75d461f116ee078dc76/wejegumerizodulosaga.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/82576044635.pdfIn PDF document text
    • https://ntwbearing.com/UserFiles/File/37311861747.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/22028342361.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608718f384cc5---kubufutetovikosejirisuri.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80490289954.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9edd9e036b---wusalosodo.pdfIn PDF document text
    • http://belst.by/upload/file/fugaledasetaxita.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/62014856954.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/57434023820.pdfIn PDF document text
    • http://abwrva.com/uploads/files/32228724603.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/cfc930e866f5bc388b73c3b91d1159ac/47660047807.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/ea1e435aecd19473285824a32f915088/milizezomu.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b38eca190ab---rolofomewubepigew.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/32876219536.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/befabufovamatefud.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/9979332133.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160c257b28d2d2---gumenizetewuzomeka.pdfIn PDF document text
    • http://allycatering.com/userfiles/51687433261.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f9582df53---70219520897.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a50344780e1---wasowupazolufobiwavimalo.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1609464943ae9f---17254625097.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_off00010888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10888 11312 bytes
SHA-256: 8d5f1eaf5156d32b3408dbb2bd807e37d1339416a82d3d6342dd15e11df2edb2
font_01_sfnt_off000122ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AFC 18632 bytes
SHA-256: a697af449309d8b47458b93db1ad36ea7888155c13dd00d5aa96a30850fc9fb1

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