Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b0cb5927d2dd2d0…

MALICIOUS

PDF

88.6 KB Created: 2021-09-08 05:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c6b466cea1379520b4e11a8af8d31c7f SHA-1: 40a1080d0fd3ae27a3b444c8037b04f45e5ea38d SHA-256: 4b0cb5927d2dd2d01a4f9cc7c736ff701f31f7a03218b4879c7d6287fcebf608
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and the ML classifier returned a high probability of maliciousness. It contains a link farm pointing to multiple compromised WordPress upload storage locations and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs are designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://tongdaidoanhnghiep.com/app/webroot/upload/files/10248086401.pdf In PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/46439871645.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/48276908082.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/mepigijelusepaxoxabejog.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed3b83ea8f---kavegezobiwidi.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/94887405134.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/levuwe.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/54767349680.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/83839655838.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/491187e91d6b67eaf24d1874ecbd8957/50716233434.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/74393484599.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160accd1e2e14a---28929072915.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/95352786219.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/27036538961.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/25963711399.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723941243e1---65422447303.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/14833745773.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/medavesavawuguxibowono.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/76499346675.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/bozupujiwoba.pdfIn PDF document text
    • http://mav-auto.ru/images/file/vowak.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021070815102573499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=whirlpool+cabrio+dryer+manual+wed6200sw1PDF 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
stream_006_off000135f6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x135F6 18692 bytes
SHA-256: 26e7178f6fb756d8d4fd64b43ca9e9ee7e380e740c06b18089f3b9f810a0f761
font_00_sfnt_off0000d3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB4 18068 bytes
SHA-256: df982e600824028ec9c67619ab06a609f0bb8ea0b113fd03825d412bf1435a06
font_02_sfnt_off00011ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACE 11576 bytes
SHA-256: 810930a8aac05770bb195c41aaa78db57464b5148d9c8b62727b998869c079de

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