Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aff1fbfa3ee7ca7…

MALICIOUS

PDF

86.5 KB Created: 2021-09-09 12:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9da668458d6a86b51e743e189052029c SHA-1: 77a4919fe84ad0d1e684e54c2527ce212e9b9e70 SHA-256: 8aff1fbfa3ee7ca70a8d5bc0178aee50b873a8a8d5f018df91ec993e7b665ad1
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of 'utm_term' parameters in some URLs suggests a potential phishing or SEO-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://crysiq.ru/uplcv?utm_term=logic+pro+x+apk+free+download PDF link annotation
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613576c29b25e---98674032461.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/17409265357.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/muxed.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/4263494772.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f42a46b627---femujifejapovagegupu.pdfIn PDF document text
    • http://emploi.nat.tn/ckeditor/ckfinder/userfiles/files/rosewizininasoso.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/97346287614.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/13922513267.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/vutekudozukuzi.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/61467602596.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/58562290201.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/sogowu.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/tuwikagapirivig.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/78432680910.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16138e09bbff4c---bodapadefedirigoto.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/6cef8c982610f6eb3184c04904e1352a/56686185005.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/2169856779.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/92951294269.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/giwovegikuzu.pdfIn PDF document text
    • https://citytrafik.nu/images/file/tumejamojuzidebilu.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/70986624348.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/96843439639.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_off0000e9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A3 19236 bytes
SHA-256: e116091e8b13b612bb977dc35caae7e09940a0d726a625e3e8e2ff02f5c103db
font_01_sfnt_off00011bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C7 10768 bytes
SHA-256: 47ae09cc1be5d1377abff34b4b0592c5a2971b0836c6b0f56199ed5ecc1d6007