Malicious PDF — malware analysis report

Static analysis result for SHA-256 af5e3d7ec3709d68…

MALICIOUS

PDF

105.3 KB Created: 2021-06-27 22:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8c1d7e1109a99140607e2084c3bf4995 SHA-1: 3568aa9bb4cd65c29f836d6a671327135d633e0f SHA-256: af5e3d7ec3709d68ebf0809155f3b637eb7aab3cf0f993a1afae138ead7df339
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external URLs, many of which are hosted on domains associated with compromised CMS uploads or disposable hosting. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF is designed to redirect users to potentially harmful content or facilitate SEO abuse. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 5

  • 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://kancelaria-perfect.pl/app/webroot/media/files/60112237149.pdf In PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/23dcaf88be52479ffbb615a8f732a97b/31935927071.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/9011141518.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/9719999309.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/80662764981.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/sesolelov.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/f24e97ad1975c229a3b2048cf93d50dd/denovapozoforove.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/majexasubom.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/92391650469.pdfIn PDF document text
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/43922036162.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/tetatanerunokegoja.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/96471177377.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080d2cee3ec9---64069880137.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b154746342---25213113906.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d00bf2236---wotagagasajig.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/o8d66d1776f5231ofqgj9k75k5/risuguruwewuxoka.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/63637673146.pdfIn PDF document text
    • https://alutat.com/data/file/11044873060.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/oacjfjk42lato622nhm5gjp91n/xeniripadigoneb.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/666pq7qhqh3atak67li6u75nq1/62671784831.pdfIn PDF document text
    • http://globeksa.com/ckfinder/userfiles/files/56225986446.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/qsntouiu80g1fqon77devcn0h2/liwewovadapipuzivuwolotu.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/13242f241eb3099fc010e0f33e4d94c7/katawaxoralivamokataribuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=list+of+animals+with+picturesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12013 17828 bytes
SHA-256: a6fd25cd2ea504106342b69e40260e6d5d9a36ff47314dc578ffdb7bf2446397
font_01_sfnt_off00014f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F12 16700 bytes
SHA-256: 263fba459c43ef75c575ca363a77cc798276f4a347a51b0e06021682a2b3c25f
font_02_sfnt_off00016696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16696 10888 bytes
SHA-256: dc82b343b60bac321658dc723f4dd949f3ef5cdc8ee8e9c5cecfc694eda938db
font_03_sfnt_off00017fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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