Malicious PDF — malware analysis report

Static analysis result for SHA-256 370af34cc7509475…

MALICIOUS

PDF

91.2 KB Created: 2021-09-06 10:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 17af983139348ea9f7038e9467f32268 SHA-1: 52f721ee8aee2a0df518a745a3dd11eb4f5134e8 SHA-256: 370af34cc750947524e038a4d60d3175c908cd5758479630fcd68c30802ab99c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of external links and the nature of the heuristics suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c645cd27e2d---gorepezelobovawo.pdf In PDF document text
    • https://qqhanoman.com/contents//files/majidudanezixapa.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/81108545193.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/27946616815.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/buwukijabozifatesogipap.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/30217150084.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/45464396714.pdfIn PDF document text
    • http://saydersan.com/firma/files/71675067540.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/bosavoduzesuz.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/21788664265.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/dezerawejilitolotorofinek.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/puwulanaladowugefezuge.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021051609314710.pdfIn PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/76106db458768a3f0a7c40e3dd936455/29981817451.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/buwevutuxabufagof.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/6346861727.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2376e85c34---14813369221.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/50492830883.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084ec1c6c6d7---sirekutisuv.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/ruwalepom.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/24937616492.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/57807196286.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/goxetevokari.pdfIn PDF document text
    • https://areicon.com/images/file/gipabivobawolajumin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=bbc+learning+english+mp3+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_off0000fe1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1A 18120 bytes
SHA-256: 9e57b63f96c18275bd62a8ff7a55497198c940def6d626b1e002efb66defafca
font_01_sfnt_off00012d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001458c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1458C 11212 bytes
SHA-256: 156876b09ec847b4d0b4024f3a85ed1148503c0e2e88b9b94fa4ea057960ee05