Malicious PDF — malware analysis report

Static analysis result for SHA-256 854d459ab31e8859…

MALICIOUS

PDF

156.5 KB Created: 2021-07-15 23:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5b623404518511eaf277823c967c6b5b SHA-1: 5b60940d3dd6ba16a7ce76e272a2b9c55a98eabb SHA-256: 854d459ab31e8859a002b9e89a7921182f9ed3a07253920ffe20005064ff0b35
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, evidenced by a high number of external links, many pointing to compromised CMS uploads or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were extracted, the numerous suspicious URLs suggest the document's primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://sysquare.com/UserFiles/files/1541549514.pdf In PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/c0a1bb8c0962f1252b3e1326b0e2c8e8/lelozepigogavo.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7b24e15d4---nebeduromefodeni.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/e5164ae9d85f4e83b793edcf3027bc6f/37608751498.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897f6a8d6f2---60635006968.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/96200928094.pdfIn PDF document text
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/buwofuz.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/jebowalutufezu.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/govol.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/samek.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5709cc881---motatujerimawixopep.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/46373137634.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/80470092484.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/85181e96172adaf88187e30fde11525a/21920714480.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/48a5bb88127a1c426188c4bc1e63967f/buxekonekitoguvakitajodav.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/0ea1760d9ff2ce4869460a94bcd88a67/fizarememix.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/todeduwu.pdfIn PDF document text
    • http://teckim.it/themes/userfiles//files/bokasujesa.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160e0089bb3ae9---40066211067.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/7fe49a1c1310d67b72e30b97358c727f/dubepemeduzadezupesilakoz.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87ffd85a3c---petiw.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/0a14cf12ed71eaeb1731a1ea237ad39e/9515286529.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/b42jl5egojqivbp09bhmviic15/tulazogekilisaxojepa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=most+influential+economists+todayPDF link annotation
    • 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_off00020400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20400 18700 bytes
SHA-256: e7aa78de332596a0bcc069ccd6c9941eb3e27b0fb17a48b8a2ca563980c87370
font_01_sfnt_off000233aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x233AA 10744 bytes
SHA-256: 9f3d4fa01b7c1ca3c85903dff561ef81c6b92f188129a97093d53a25ef1881bd
font_02_sfnt_off00024c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24C6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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