Malicious PDF — malware analysis report

Static analysis result for SHA-256 e051a19d8466b8ca…

MALICIOUS

PDF

82.5 KB Created: 2021-09-08 17:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 30ae640c9440b5548a8211939d20f916 SHA-1: b106eee419a89428534b2e2e2815b5ab0c8f80d3 SHA-256: e051a19d8466b8ca40161b51f84dad7e8f6e79bdc9f3eebea1e3339fac79434c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV and an ML classifier as malicious. It contains a link farm with numerous URLs, many hosted on compromised or disposable domains, suggesting an attempt to obscure the final destination. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a tactic to distribute malicious content or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://mn-print.ru/ckfinder/userfiles/files/zanelatux.pdf In PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/79456055863.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/4371931157.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/6633916327.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/1187682729.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17705888586.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/66888043007.pdfIn PDF document text
    • http://mcrlclient.gilcom.ro/ckfinder/userfiles/files/meberux.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109012348428822.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/xonimu.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e3d044f51---28292866461.pdfIn PDF document text
    • https://luminex.pl/upload/file/nufobifi.pdfIn PDF document text
    • http://mlead.net/images/e/file/dirifoz.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132945483801---19982591417.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/zusosufutexe.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137b54023526---31292398275.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/jujodarutomuwugisulavoj.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/99544006385.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/sidibebonume.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/tuvexamojevuzajideliv.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/3237393393.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210908_4B7B95D3150595B5.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/45803831576.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=chrysler+pacifica+touring+l+2018+manualPDF 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_off0000da3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF253 11676 bytes
SHA-256: bdf325bd5c9e45295eb7da584a6ede6a32266e87d69117e37b569782146e995f
font_02_sfnt_off00010e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E17 17648 bytes
SHA-256: 5af2e6238ebf43284e9c344c4102185daae32ba9879ba0a3afea97243804c481