Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc7d5c6bf40f343…

MALICIOUS

PDF

62.2 KB Created: 2021-09-19 13:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ff6b200188583271f81dc1833b6b5959 SHA-1: 0517c1a18a79b29d10fcaaa04f949b022d24c063 SHA-256: dfc7d5c6bf40f34335b28f9ecc1bb2f9dc2c6b1c74a071f1391f73b639aeb478
154 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to compromised WordPress sites and disposable domains. The presence of these links suggests an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7424

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16146a704757b7---93717318428.pdf In PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/23199700062.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/37766633760.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/vagogalesekiwoler.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/dusibexo.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/64091278354.pdfIn PDF document text
    • http://hcm-invoice.vn/hinhanh_fckeditor/file/55872358874.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/57873343242.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd31190e0f---vowadimosuxeb.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210914_101233.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/merij.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/97024160416.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/wegubupe.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451cae14d0f---kedadixonanaposisatogine.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vofimufudifugo.pdfIn PDF document text
    • http://brlairport.com/images/file/musimorekoludalosazimeme.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/161411eedda824---lovopimigubevutewa.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/11733193624.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/99847756408.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/bogofanebibil.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/gemonuzobalipujo.pdfIn PDF document text
    • http://bscartridge.com/pic/lamimij.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130412c42f88---13518396509.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+do+you+get+rid+of+an+app+on+an+android+phonePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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