Malicious PDF — malware analysis report

Static analysis result for SHA-256 fccfa5a286a89b96…

MALICIOUS

PDF

74.6 KB Created: 2021-09-07 09:38:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4d51c74a2a67dfb2bba9afc15d39ab80 SHA-1: 8be85430d8db12dca6979c181fae0a03cc63c2e4 SHA-256: fccfa5a286a89b96b8d15cabb612325a9e957234bafacb18be896d843c8c2719
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous URLs pointing to other PDF files hosted on various websites, some of which appear to be compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple links to potentially malicious content suggests an attempt to distribute further payloads or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://modernplating.com/userfiles/file/34908203684.pdf In PDF document text
    • http://iwishop.hu/file/dapiletejumofajaga.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7u629gcnrfkb328qd6bbsri0c3/6195677532.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/e71f96531d0c93d1aaa2809a76429a14/73482951248.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/wuzozuvite.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/b2db60aa508e5075cab36c7ee9f76bb4/21291998719.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d65f4843fc---wupakojipar.pdfIn PDF document text
    • https://znalac.com/userfiles/file/vexasetif.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/10619021833.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/tatizukezubedaritifutul.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/rasajuvikalufasefi.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad964310258---30071694136.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/liguresoxubakeguzesazole.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085c3cb4c9d1---75019580707.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/xedixil.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210508/file/ginulatejujade.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/496ebd505eb575434e95182243544ab1/wowekewiduwid.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/42822610885.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/38795014201.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/gngvncm8095fulef5gpccj0odc/90244556333.pdfIn PDF document text
    • https://jagominum.com/contents//files/jutisasixasalizavu.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/31943449122.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=lectures+in+functional+analysis+and+operator+theory+pdfPDF 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_off0000bb6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB6A 17804 bytes
SHA-256: 350f3e221232aa58980e1d95f7c7cfaf6ef07ad1ca9aa2784c382c1c31735185
font_01_sfnt_off0000e96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96F 10888 bytes
SHA-256: 71304e5fa7569d1f3ea8520bf11509a2ce81a729667424f169866725b6e5ffc3
font_02_sfnt_off00010293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10293 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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