Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f4dc1b1330ec026…

MALICIOUS

PDF

88.4 KB Created: 2021-09-05 05:07:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 53376e101a3c79bb23f0704011ea745a SHA-1: 9e6a5dff3653755823e4f7afa503e9cd3d6c4381 SHA-256: 7f4dc1b1330ec0263e16dcd1f726f5bf96c3b3e3dfd268b62d9fc7a4f863234f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/08268c665f5a4a622165b376248eaa4a/14949298350.pdf In PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/b7rsonrkgli9fln701febm8qak/sededadakememegisivav.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/webojejinanabale.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/tirumurefepopina.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/wozibubegizagutajizefero.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/1vkgf3hjh8gcb25haocr2gaa1n/79554347982.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/79841626739.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-2/20210502013419430520.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611b6a2130ac7---sujurizipozemeke.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/90703089601.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/jikaputetiravava.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/xujefuzolubi.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160c072d684091---tuvutipaniwamigozubaxozop.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/234f3dd12896acd694d62f389585ae8e/45301964638.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/22479632211.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6eec2924e---66495935399.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/xivibusugis.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/908584629.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ea5b28cf8---zipugenigi.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607be69d0878b---83442621112.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/d9871312e633b7ba78f372332a77a49a/pasitexivetudexa.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb71494d16b---41869087223.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210623160455134.pdfIn PDF document text
    • http://smn69.com/clients/866038/File/tusonazowigolunid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=hp+z6+g4+workstation+service+manualPDF 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_off0000eaa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA9 20416 bytes
SHA-256: 9e354fb852a994ae688bad77cb98b63a192336160eac12eaf53c1b0b7183dd75
font_01_sfnt_off000120c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C7 11356 bytes
SHA-256: 8bbc3aa5a3c58e41b42dcb8c0aa8f405550826e651359fd28f31abbaf828e173
font_02_sfnt_off00013ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1