Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f5a58a8a3cc56f1…

MALICIOUS

PDF

83.6 KB Created: 2021-09-20 00:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 74daa5843677d6325cd18c78f57c4976 SHA-1: 200e8416d2db01150cfdaf4429d7c91c57765d1a SHA-256: 2f5a58a8a3cc56f1924db9954d6b4b8a73818c68db19c35be62c60e140592ac6
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV specifically identifying it as 'Pdf.Phishing.Trojan'. The document contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'utm_term' parameter in one URL indicates a potential phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://allytemp.ru/uplcv?utm_term=new+gun+game+2021 PDF link annotation
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16142a9a19b9b4---46213551756.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/tofun.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/99593448105.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/69577784433.pdfIn PDF document text
    • https://dienhoanghean.com/upload/ck/files/97819245528.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/zabagilokafer.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/1485783747.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/vevenujaforega.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/41256409904.pdfIn PDF document text
    • http://mopron.ru/upload/files/87082073924.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/4fb36e088bc072097ccab0ebc449b7c1/67665978865.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16133ce8d6c283---fokevosuvetobubenelerezop.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/815248659613f4cb623225.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/64399028581.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/35933992887.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/78298993901.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/161363b1e24251---22052073342.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/sekovimufopexolabunitek.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/96714039629.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/73113993736.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/wofarew.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_off0000e071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE071 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF883 18856 bytes
SHA-256: 545ff88f4c5dbef6707ae686dd8556a2144d8344a3cfca2b1e57e43b8275f7e4
font_02_sfnt_off0001299b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299B 10284 bytes
SHA-256: cdc627eb1324482de37879bd404cf8fc940fe87d2c232086efb7e56a1a8e697b