Malicious PDF — malware analysis report

Static analysis result for SHA-256 246ca017e14ec88e…

MALICIOUS

PDF

82.3 KB Created: 2021-09-08 00:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e8df5056ac982e524be0bb0daade909b SHA-1: 8d7e266dd9b5d552187992befbcba87b496f68c4 SHA-256: 246ca017e14ec88edccffc2481bd32ef84d2e939d7201d39a58212e754be0f47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87ac90e8a9---88574823003.pdf In PDF document text
    • http://alisawedding.com/upload/users/files/pominedafi.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/vuzerefesisununu.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/65044727261.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/vawame.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/24720147457.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/35089352731.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/50087039500.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/21858866788.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/p1gb32rolgou76hvl3fqqjjs5m/26577999142.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/9p5tcsj68pag8c73273m4552bs/jiwedekisusajixukiwixoso.pdfIn PDF document text
    • https://ksuskalology.com/images/file/7611560183.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16124ecd9a6acf---7620088450.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/84121518433.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/pofemopo.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/ac58b0ce871abba3f5a55d27695b7cbf/32757384994.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/22605050679.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/93843596573.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/11508953281.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/97265972470.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/ladopoze.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/gemofabefikataw.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/21570331310.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f136436e0caa7a4458d68b939326892c/51532179604.pdfIn PDF document text
    • https://turbooto.vn/upload/files/74870112988.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=form+15g+pdf+new+format+sbiPDF 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_off0000dc1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42C 17684 bytes
SHA-256: 36aecc505e3b109b4e0f5fafb149cb13986b7a8be6f04ac17df33a7cec15dc74
font_02_sfnt_off000121e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E3 11184 bytes
SHA-256: 15b6aa96fc2d4bee73b4e36904c686fdd8eb33ada9948f41435be26fde835367

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