Malicious PDF — malware analysis report

Static analysis result for SHA-256 7618bea3018117bb…

MALICIOUS

PDF

86.1 KB Created: 2021-09-01 01:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 02a686417953a6ac91b77ff9dfe15e3f SHA-1: 1870959766325a45779682be016f4565f83aa337 SHA-256: 7618bea3018117bbc4efcd39dc140d1ad238b01bb536479575ab3186d0f71f57
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to potentially harmful content. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/kejifadaxuzilojozupodeka.pdf In PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/33757695711.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/kazivedilupekelekabi.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b5bfc05b6---77392618841.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/84dce03a161f797dfa2e8f67718fe1f8/35106398677.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/a2f87fbb1200f5ea596cedc0c29a8094/82580346251.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/33447879512.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbc9f12747---81766368717.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/walemofizulijikuruzi.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078adcb3c89b---83191216498.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/lotamekesimewigarikupuz.pdfIn PDF document text
    • http://chinahongji.com/d/files/70934007660.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/79343030758.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/ek281jimsfdnfuv7iq21epo86l/wufopisegorimawif.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/968d93b13f68feef14e33f7d33e3e79c/64010291366.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983216b70c8---lelopuxewefupotogifawino.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa598239854---lofokotorovefoxapuped.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/jadetaparet.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161033e2318831---76571100221.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/tuzofozegixikopivudezo.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/a92fjdu3j8470aeuu8esl8cr34/62631334951.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/susaxazutozukepevux.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/jagevepafekaxakij.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/famubutipopu.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210701161147.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=what+is+a+core+40+diplomaPDF 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_off0000ea56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA56 17944 bytes
SHA-256: 1f374bcf9062ace10447e088a60a295b2ed7b68548bf04f72339301f2081f39f
font_01_sfnt_off000118e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F7 10868 bytes
SHA-256: 6389b6c1cb18579d1495627107b3a938bb86f8ded5df2af15db6858a78f9e9b3