Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f61b824886136da…

MALICIOUS

PDF

118.2 KB Created: 2021-09-03 18:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e25d2c74ceded7a54c7d14cf1b24c1f3 SHA-1: c5f8c83bfd09128f26a6cd272ea9f0ae93cb6cda SHA-256: 6f61b824886136daee3de34387e77e18647d8558407bbc99aa29b7ab6be3d667
156 Risk Score

Malware Insights

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

This PDF file contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and the overall structure point towards a spearphishing attachment as the initial attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://smidgel.ru/uplcv?utm_term=mitsubishi+lancer+2017+workshop+manual PDF link annotation
    • http://autosklo.sk/pictures/file/24239802212.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/94991286815.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/lodefabowetab.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/u2oe2uin8ecv6nm25peid6hg85/zoluwofodarixof.pdfIn PDF document text
    • http://ledson.ru/upload_picture/12413027248.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f6acaef173a---mexar.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/179759627ec3bd2052bfcfefcf8e373b/kuwasoregokex.pdfIn PDF document text
    • http://suankaew.net/upload/userfile/files/77135314961.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/torujotikag.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/murela.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/wawinatuvopaladilazud.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/68pt03qjn9pti74hreqfrj5lp5/pejulimugolasepuvugiti.pdfIn PDF document text
    • https://capecoralliving.com/media/file/89049968111.pdfIn PDF document text
    • http://mosjob.ru/images/file/depiginewija.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/kimeforalusufir.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115118e80d8b---migaguzoseneleretubine.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/bedovijanupebibagakivek.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa//files/5355836516.pdfIn PDF document text
    • https://btegypt.com/file/vivulabetowepegexap.pdfIn PDF document text
    • http://aven.su/userfiles/file/fexegabezade.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/18405300364.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160814ac12a94a---xoxiloz.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/391c0aa43792129f5db1173e5712dc23/55108984983.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_off000164ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164EA 11396 bytes
SHA-256: 897fa7594c8db67661e5772a1e1978c57eedf0575bbdddbecc25ebf0c7d7bbde
font_01_sfnt_off00017f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F96 19864 bytes
SHA-256: f7020f44e71fb654401b091a0568502a819ee7b1cf355abf166740d3ee6b3cc5
font_02_sfnt_off0001b28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B28C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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