Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb6624b93064902e…

MALICIOUS

PDF

98.7 KB Created: 2021-09-01 20:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 07dc9108bd3bf4d0640fab3d69d1c7bb SHA-1: af32390afc13825c9816e7ea2bcbc3a883505d16 SHA-256: eb6624b93064902e44ed26949e280d2cd6627b6df6bd9eba1bbdcd8ed3dfaaa4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://pistant.ru/uplcv?utm_term=complete+the+following+nuclear+reaction PDF link annotation
    • https://louvre.lv/res/wysiwyg/file/67556673952.pdfIn PDF document text
    • http://dentistturkey.com/image/files/vebilugarinazoxajemarob.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/2b5er9nhjf3in0vm59pn7bnnf3/84714896292.pdfIn PDF document text
    • http://pasted-radio.de/web/files/17675467342.pdfIn PDF document text
    • http://haai.org/upload/file/89259623488.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa717e1ec---wifoma.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080ef9cd81ab---wibixuzejinumabatofowiz.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/47784327482.pdfIn PDF document text
    • http://coffee33.ru/archive/file/30171388834.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16099bec0f3552---57561662280.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/givolegatorotofe.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/gozatafelarobamiboxeba.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/volazafozadebisiteto.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f175bced3f5---74863695506.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/64fae840c675ca776f4bd4750692afb9/vorelomopezinasove.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/17604eb15f8c14da087a5ecc5e24b56f/jobazubin.pdfIn PDF document text
    • https://birotex.rs/images/files/pujozazewoxowowojijojina.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/58091060939.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160df73c08d844---kefexovukawa.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/82dabdfca8e6fff44420af16607fa043/jaganokifukozowinalutu.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/08/21/madusojowigafusi.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e91d2ed415a---87330122153.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaeec820e3---pubejizuwidufizadatomaz.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/t7317m6ds47k2ggiuf79oo76to/fodetoramibudawanasavap.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/konusa.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/45930954258.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_off000110d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D4 21332 bytes
SHA-256: 89390435d1b4b1bb801ca7eac17b2a01011982c77c87d717ddfef6f6d80d9b80
font_01_sfnt_off000148aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000160c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160C1 10976 bytes
SHA-256: 031a45ef46fc562794dbfcf1f339108aec4f67407e0a0c4bda0fe01f5b09c6e7

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