Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eee21b1844fcf1c…

MALICIOUS

PDF

81.3 KB Created: 2021-09-05 04:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8b46490b13560d45f21b2ef66c09e37a SHA-1: cd91a516a43aa484c1a88c3b4cbe7e98ef432961 SHA-256: 7eee21b1844fcf1c0a363aa24599c3cad37d46d78a813e34cf6622243c0f33ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the embedded links and the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/deaabaade0feed4d30f9431fc4b75aa0/71975374415.pdf In PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0dea4f626---57774786930.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/0tt4q45qioa6p6tbadpttr9k12/fegevapijosetovokis.pdfIn PDF document text
    • http://benetalent.com/upload/files/22090257215.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/11478696116.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be5ba0e5e4---21789696825.pdfIn PDF document text
    • https://zold-kommando.hu/files/56374474084.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/44818041893.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/43133966058.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c2efc1813---29773469114.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/n2184qn5fia44jhjn8fv2eedb5/35854797324.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa32438500---tevotozowolawi.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b48dfc5658---dojovovajinivugiwen.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/pepefagowaxu.pdfIn PDF document text
    • https://triosms.com/userfiles/file/28456345545.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/fagavewaponafabefe.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210726064620701.pdfIn PDF document text
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/54429955529.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8df5099c3---gudaroxasodofokaj.pdfIn PDF document text
    • https://sce.tw/uploads/files/6119f02e0e4dd.pdfIn PDF document text
    • https://strechybenesov.cz/content/sazulewajelutadeza.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/5cfc243cba9a6a0a20057c18dae5de20/toxeg.pdfIn PDF document text
    • http://wedding-ideas.ru/ckfinder/userfiles/files/xoxujixunedemazuxide.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093b1c7a0529---rinonudetela.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/41678919194.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/28963963951.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=learning+style+quiz+for+adults+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_off0000db5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5D 16516 bytes
SHA-256: 2c6b702b9f628e2cf16564c8563549e4f0c15c7c0e799de975e93e0cc652868a
font_01_sfnt_off00010592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10592 11052 bytes
SHA-256: eef0a0e00e866594549df7d77e083ee11bea80444af7d0813260c691bf2c8a52
font_02_sfnt_off00011ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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