Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa31e56ff099d475…

MALICIOUS

PDF

83.8 KB Created: 2021-09-01 01:35:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 438e3c99ae23904d64eaafff8e18f4b0 SHA-1: aa7f6d6c91d957eca5c25e81987ec257d54c4d09 SHA-256: aa31e56ff099d475d1b681b58985d7cf495d1acfd4972b2a479839ef3674ad9b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/2c321c85d1ada0d31da4ef1021ce0e6f/fekulezile.pdf In PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/mtesj5b6s035e1913oh1urrgic/zolirajudalanukajezo.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2f4b1875b---barazijizeg.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/39676282737.pdfIn PDF document text
    • http://chamdure.com/DATA/files/kavijaxefenipes.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/o4f2atqmgronmam52iak9p6efv/36430401031.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/81093210556.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/54755716261.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/89974250038.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610ebbd19bc72---60700978881.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/89f7a65915afb490c2673543f80fca6a/33726014967.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/a2q768ksj7groj28cegr5d3c3s/56390981352.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/dimedudusobufalufemug.pdfIn PDF document text
    • https://robertbah.si/files/file/85968377620.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/60002073605.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/dabofiju.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/pilibesuf.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210706_10831014B2073AD4.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/684di6pqmq7gge66mhl1dhgdrj/98412900322.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/69968383476.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce8ecacfa0---2268062960.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/32956049485.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/31182110153.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=save+the+last+dance+full+movie+freePDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/vakumut.pdfIn PDF document text
    • 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_off0000e0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D5 10980 bytes
SHA-256: 53672b1f7361fa0465b2afe37471273ed2e537a9e34f0ebaba197c76739aea69
font_01_sfnt_off0000fa1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1C 18536 bytes
SHA-256: 721ab04cc132b672c20c5cd092ced9022b10658f873e7f1c8b0d7037607330bb
font_02_sfnt_off000129d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1