Malicious PDF — malware analysis report

Static analysis result for SHA-256 044c902839bdae77…

MALICIOUS

PDF

69.6 KB Created: 2021-09-09 02:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 92449b4687015c788bca81a58322731c SHA-1: 64166543a246aea5d53c363d2585a3815314c1d3 SHA-256: 044c902839bdae770191851318c00753a8ff86433d6df70a92369a60dfc65a62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF's structure and numerous external links are designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a245ed22d---jiwugiwilod.pdf In PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/subobibaniwejet.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/71896037870.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/26458564279.pdfIn PDF document text
    • http://prestopc.it/upload/file/65572749034.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/591278821.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/161336e505a620---75791238234.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/6mbfcjhc31vonq53s6ophvj7gj/gopokaxinuvepavaduzowo.pdfIn PDF document text
    • https://aneri12.eu/res/file/soven.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109081419154218.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/wuxevapuj.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/tudetejuwojutupixuzawujab.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/36268679084.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/rajumenofalatejavisas.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/f34b7980ea9b3dbf915ae7c6cf7f802b/tarusizufoxovuxibe.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/mifutiropurane.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161387bedf1d07---nitawudumogi.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/31481608487.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/44150594545.pdfIn PDF document text
    • http://amdind.com/userfiles/file/modekizebogufizak.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/rogawakikume.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/96638702397.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/lotexe.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131584b0ee4d---laxiridozezetu.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/88443697684.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=omsi+bus+simulator+apkPDF 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_off0000b0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C3 10532 bytes
SHA-256: 73a7c81b28ab53988d5ccc1486dff36017abf513528518b70aacdfd2ea454b13
font_01_sfnt_off0000c899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC899 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AB 15788 bytes
SHA-256: db9e991d787c88e3eb19f699fe448e49fde86480d36f59bc2e31fd6407146746