Malicious PDF — malware analysis report

Static analysis result for SHA-256 77d2cf1d4f844115…

MALICIOUS

PDF

83.7 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: 20db3f4eb2ca7cd4620e5ef9e5290294 SHA-1: 1e4844fe0542783d3d7c56b258d2ab6ee2ed01a6 SHA-256: 77d2cf1d4f8441154bfe3a5518a50b6d5be664dc6fc2977a6603151fedfabc7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to numerous disposable hosting domains, suggesting an attempt to distribute malicious content or phish users. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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
  • 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://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://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_off0000e0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF903 10856 bytes
SHA-256: 2e787280f0cedb46ce98dc9a12f0154f8dfcde7bb046426b32f34bae5a277a8b
font_02_sfnt_off000111cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CD 18092 bytes
SHA-256: 12651194c17ca94c2c4deaffdd923a0470efa51d7032752c47b29b3a8f462af3

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