Malicious PDF — malware analysis report

Static analysis result for SHA-256 20e913b2113e1a42…

MALICIOUS

PDF

95.8 KB Created: 2021-06-29 13:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 16bc4db054c4f4c2ce0ab9d933fd2a07 SHA-1: 18e9dfa2ce8f704294299af6cbc293c6b4cefb9c SHA-256: 20e913b2113e1a420bd89b545bd3c0be417033edb5e1f8e9db45455e5faca04d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a PDF link farm. It contains numerous external URIs pointing to compromised WordPress upload directories and disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://allytemp.ru/uplcv?utm_term=mica+is+made+up+of PDF link annotation
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/f50c8b5ecb29ff1006f461c88a56a326/zewodagakexowagezifenafi.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/7441ea619b069c040ce913288a6f5e6f/wejixavanewekejejeg.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecacb187ae---waduxazukinos.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/158c5bi8ia53jdu0bvitfh81t6/bulosujez.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4b2a2121b---karupa.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/83917019064.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/37ptf6l5df8rhmhuc5jul3gosu/51455925763.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/77110162602.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/fdfa2b5d63c4db3658d1a99a43cd5f0b/23014952471.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/85128406001.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc1c95d7af---fukopibetedopori.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c417ab716---43454484465.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/8495863875.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d65c45f161---fivorasegunimedapavaxawud.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/64021827174.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/jgniqtd3ilhsbvnk5gbnl77r88/wivefibikusosipona.pdfIn PDF document text
    • http://huiking.cn/uploads/file/070013194706.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/91024347329.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b4d677ad1---mukamesupereki.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16080a0cba25b1---81531899875.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/a26524d34a2fed7508d2d1664dc844a5/medosulo.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a9021b07f5f---81214974038.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/padesasodinizipezuvubopiw.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/73872ce0a45df466746aa7f11023a6ae/63459537800.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/92164470644.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ace32e78a---41052519094.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16088165c7ccb6---78711747129.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_off00011178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11178 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001298f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298F 10528 bytes
SHA-256: 97f665d31d4c416fcf82fbdacbf1a26c9a9f563ee7650b55a4c4d2558be2fc3b
font_02_sfnt_off00014190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14190 18404 bytes
SHA-256: a9ab6d3aca2141a577dcd50190181c5b297585ea35a28f8dacc5217bbf5aebaf

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