Malicious PDF — malware analysis report

Static analysis result for SHA-256 03cca9797ff5651d…

MALICIOUS

PDF

96.8 KB Created: 2021-06-25 14:28:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a20d8f77485b915255a7aa0be097cb58 SHA-1: f3b23d9114bdea58efc6c8ebab0ad04ada7440f5 SHA-256: 03cca9797ff5651d0b37d647a30c740f5ab05ead63dcec51f7f6e0c507fee544
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. These links are likely intended to lure users into downloading further malicious content or submitting sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/cc8cf0b9c1fe1db499a4881069ac3631/80737594213.pdf In PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/suvowibutibozatevasowu.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/27689199512.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/sirofivofaliguge.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca5c1c17694---rimurolumizodo.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076ffe8de8f9---jozawatutozobisaxadoj.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/81199380684.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/22702545890.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb56f656c1---16357114933.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca77e6a98---14691703048.pdfIn PDF document text
    • https://migger.dk/userimages/file/5238721988.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/g0j4tlvervrup5h77g906tkikk/84510503085.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/kopewalorovawafivirajiz.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ac7f2c016---36317475218.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=selma+blair+after+we+collidedPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE620 16576 bytes
SHA-256: df3eedeae3976c41e4b0d0cf4ca3e03e2c0a174ce5548a6b09fbf00093765c32
font_01_sfnt_off0000fd59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001156b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156B 23916 bytes
SHA-256: e0b5be11913d8602404e478a3f4d51bf77926b21a6fc06ee68f856cb5e67eafd
font_03_sfnt_off0001530d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1530D 2248 bytes
SHA-256: 66561d23f2eb1695a39bb9f88b80d9683298b042bd99b179776941a2f3878adb
font_04_sfnt_off00015cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CF6 10668 bytes
SHA-256: 42256ef8f85336ef32aed31304f48d5dc2ed41886aa3ca1b66c7dc04995ee026