Malicious PDF — malware analysis report

Static analysis result for SHA-256 107c6748ce496bad…

MALICIOUS

PDF

87.5 KB Created: 2021-09-18 08:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3894ea0e4bd10a0a1aa7d3651590bf59 SHA-1: 3bd420c96fb0a258dd23f6f8f0a094cd0871846d SHA-256: 107c6748ce496badeee8a0a7d1eb4a86ed4b501f5e50c6503d98ef02f65e9b74
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. The embedded content, though heavily obfuscated, likely directs users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/13854328169.pdf In PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/bekiwawo.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613fc8bbc89e4---xazirizodewasopu.pdfIn PDF document text
    • http://fxlcd.com/upload/file/zinizubufuxubiruzakujepo.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/feguvibalilef.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/korarojajoxi.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/xiwumoxaxetejuvoxoto.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89207442103.pdfIn PDF document text
    • http://hk-keber.de/images/file/mexujitinares.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/73000113190.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139eb92babda---89786806718.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/9645893390.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/woxaguxupono.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16143e579e9686---vaxiso.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/2338594384.pdfIn PDF document text
    • http://topflexsports.com/uploads/95817574256.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/danakiwulojewuvotu.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/82620565087.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/39584919604.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/pipagovesalufapevapubetoj.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/27521854647.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/c8rvb2m0pklj8ckli8i8e123vs/68847872711.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/toxenutaj.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/43805987081.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/15820455379.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=cara+backup+kontak+bbm+android+ke+gmailPDF 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_off0000eb41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10353 20116 bytes
SHA-256: 57155dd83406aaa1dbe886898b936c5bc6211f2981a715f7d66fa378c4d9c2cc
font_02_sfnt_off0001369e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1369E 11052 bytes
SHA-256: 02c6656a139ff934ab9bdb507b37ad13242ede04f61ee0dfbd4c10ac41f9dc21

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