Malicious PDF — malware analysis report

Static analysis result for SHA-256 70f9401b338d8db8…

MALICIOUS

PDF

80.7 KB Created: 2021-09-05 03:23:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9f264f3b3bbb3709e768f36de9ffd02a SHA-1: 710a1a849539584a89e11f53ca1017d3c66f6759 SHA-256: 70f9401b338d8db834d6e94e662c1b9ee44c7a4bf9723df2f30b81194e4de734
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely intended to lure users to phishing pages or download further malware. The presence of multiple external URIs and the classification as a link farm strongly suggest a malicious distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://garglob.ru/uplcv?utm_term=livro+gramatica+da+lingua+portuguesa+pdf+download PDF link annotation
    • https://indobaliart.com/sitefiles/file/xunasejemebes.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e92d0d0623---95857490463.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608515c99a456---50743824217.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611eb3fcdd4b3---70449479652.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fd574be72---54255542543.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/8lq4eqnnung63umeoki1j9chkm/93249184539.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/a0f1319c70fc8479d23f4513c0a28055/gemipokomak.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/77043771498.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/xajojesa.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/42865328988.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609861cde567a---xepatopugapa.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/53019990553.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/d2df5c61e0868fa3596e881d10cb92de/9594654321.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160716dd5d2e72---39002789286.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/senav.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/15039615701.pdfIn PDF document text
    • http://ombs.ru/uploads/files/zufawoxas.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/fusavugowopibosedik.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9f822bb91---80754206680.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/eqo1l9fvfu2diu9be0tqeajv85/65716684599.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bca93bf6c---pofowexexiwuzujeb.pdfIn PDF document text
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/xirafojowefufixedaburif.pdfIn PDF document text
    • https://artenika.pl/fck/file/nojikusilepem.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/45015426887.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160f942e51841c---85161612732.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/jejos.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_off0000d1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EF 18828 bytes
SHA-256: d7ce70981f325290796e48d2216ccaf2ad48cfa1ef4c8b24659734a286668074
font_01_sfnt_off00010309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10309 11172 bytes
SHA-256: 331136ab998e434c0a528c6f53bfb2abd9954dc4e3f23b98640b7ba42c27443c
font_02_sfnt_off00011d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1