Malicious PDF — malware analysis report

Static analysis result for SHA-256 986354da001a392b…

MALICIOUS

PDF

87.6 KB Created: 2021-09-22 18:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ec27fc4f1e306820d2e1c359d152f20e SHA-1: 48ee332f53db156ac94c99039360d638720f0637 SHA-256: 986354da001a392b7bb55cd7cba2e62dea026cf6b473876ffcab8c7553fe8607
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing lure. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely serving as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://wastran.ru/uplcv?utm_term=descargar+emulador+ppsspp+para+android+apk PDF link annotation
    • https://vietnaminsight.biz/ckfinder/userfiles/files/86505497803.pdfIn PDF document text
    • http://lecostationery.com/files/file/78864076770.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/fizibowiwibupedaduju.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/0abef3455980d7dcdfff8ac25d70536f/42698004981.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/47782236734.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/pokomituzu.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/kidadurazejex.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/ravufiwanunum.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/takegatijigepazimadad.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161442b6ad53d6---reximifenizat.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/35514247072.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/3ef2ec34c46732262bca9a8d6b5451f7/fupadapigorewela.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/bumejiwudixamexageleri.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f95f3b5074---3061863032.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/mokiwisedufugu.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210916054612.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/47464739456.pdfIn PDF document text
    • https://jensbrode.de/files/file/78417336076.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53148713291.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/digimimoto.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109061953106383.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/31039593751.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/nabiferibiga.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/18137409094.pdfIn PDF document text
    • https://aitalk.vn/upload/files/juvamazisadedim.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_off0000edcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCD 10952 bytes
SHA-256: 996ed9bf9211a3b08005278656352f8897f2c91d760976b3ad8a850261076b7c
font_01_sfnt_off000106f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F3 18924 bytes
SHA-256: d0f178c980375bdb58f40c3990b766f55e16d4d2ea814c6abbfa7df754932306
font_02_sfnt_off0001389b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1389B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1