Malicious PDF — malware analysis report

Static analysis result for SHA-256 adc43faa6762a336…

MALICIOUS

PDF

98.1 KB Created: 2021-09-19 11:37:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6fcd08894af0935def4c619074c3bfdb SHA-1: 07ab0b57214afb96c26a76ec6120357aa0bd6e31 SHA-256: adc43faa6762a336e0b31e8cb44137ca6b30c3b20a24b3e936feffa98c35eeb2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are associated with link farms and compromised CMS uploads, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, likely intended to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=auto+followers+instagram PDF link annotation
    • http://polipack.ru/content/file/2260568360.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/vafixojotalak.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/87113138172.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/83029579194.pdfIn PDF document text
    • https://sambelteri.com/contents/files/tovemoninotu.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/200a315cfb10074c318ea47ab311725b/gizinep.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/93428963574.pdfIn PDF document text
    • http://zimmerei-possert.at/15401849041.pdfIn PDF document text
    • https://frisch.ro/files/file/88815157526.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146cbf23246d---44968425041.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/69080297454.pdfIn PDF document text
    • http://simsoncantho.com/userfiles/file/boxufifuxuwukiluk.pdfIn PDF document text
    • https://j26clean.com/upload/files/4948437645.pdfIn PDF document text
    • https://salonrewards.ca/images/file/35524422842.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/97068150211.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/sikoguzesewenu.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/tewadaxadifej.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/zokipumazeruseketaburixad.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f38da0055---33614349335.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/19257856183.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/4b4fd65d6ffa0bb3ec3bb894b2bbf0df/6009970244.pdfIn PDF document text
    • http://poliinc.com/upload/files/texewiwixopivefamibakevix.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/lawojasivozuposufatonawo.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/lirobuzibomosaropifaf.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_off00011ab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000132d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D0 10724 bytes
SHA-256: d14bad5df829e78f7c6be8432cd84da120d944a4fbc46f409c4925a2552f8d18
font_02_sfnt_off00014b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B84 18196 bytes
SHA-256: 4420dd1e55e0791b6aed5c426fada7202147c7b501ed0ad67650ec4ab600e348