Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd5e597ac1feda13…

MALICIOUS

PDF

70.0 KB Created: 2021-09-06 22:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2b48e866306a6d17ffb39881acb364e5 SHA-1: 916073a9253b2a8785589594bc3ab695b17e2906 SHA-256: dd5e597ac1feda13a0aea30ab020fb2af0114a684a1d04e53887e107f114c0bc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised CMS uploads and disposable hosting. The presence of JavaScript suggests an attempt to execute malicious code, likely to redirect the user to phishing or malware distribution sites. The numerous external links, many on potentially compromised or disposable domains, reinforce the phishing or malicious redirection intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://noihoithanhtuan.com/media/ftp/file/70668756382.pdf In PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/c31nbrbugkkdu4g4ak91el1bc6/ziponapu.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/29738443285.pdfIn PDF document text
    • http://budka39.ru/files/gelirisawoluka.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/ziparidoviwaki.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/21099928494.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/gotufejunemexefumam.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/99581198298.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/35123167802.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/27310369265.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ab23c309---xufoxojedufepuzuzom.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b0ed512c1---munawele.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609973645cc19---fabibagelarijibuvisiru.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/68128773006.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/93259616608.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/cge136vrm2m2gp1aso8kc3qihe/gigejik.pdfIn PDF document text
    • http://houselandia.ru/files/63130100604.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/samamoxiliwisadakolokage.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/0a89ad934a2f1f381897e71326b4b612/90289922186.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/45040412438.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/7d370363c8f9d08dfce493320c4b2290/33964994085.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=conhecendo+o+islamismo+pdfPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/53959469009.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_off0000b13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB13C 16528 bytes
SHA-256: 0413f65b60891a29d921107c7f76a385e1f5e0d0f445134cfc9fd2aa815d79f2
font_01_sfnt_off0000da7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7E 10720 bytes
SHA-256: 20fb9425d1b06812729c44b4862b49af3b162e0e2e136d7e53c021f3a358c569
font_02_sfnt_off0000f2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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