Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd658b9aad977939…

MALICIOUS

PDF

87.8 KB Created: 2021-08-17 01:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 88ff9b9bd45821072123592f3f281e81 SHA-1: 07cdbbb93d2c8bd753d09d05d97248c01dbf60c0 SHA-256: bd658b9aad977939c6cfab8d942472e9ed88c7095c79273b2f2c9863a034c51a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://baigeleather.com/userfiles/file/77436222835.pdf
    • http://www.kowel.com/ckfinder/userfiles/files/1626118061.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16086d774de018---99469000123.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d8626f37---40870293357.pdf
    • http://custom-mugs-factory.com/uploadfile/files/fukalafif.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a221c064d1c---pebum.pdf
    • http://hasdeu.md/data/userfiles/files/matoxemabuvinunarogosa.pdf
    • http://ecohort.com/userfiles/files/5110065709.pdf
    • http://perfekttorun.pl/pliki/38084304044.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/19996422846.pdf
    • http://asiancfea.org/userfiles/file/xapevos.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1eb95919e---bamekunufa.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16074a5e2ca2f2---firuxafaw.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb40316b34---nuvulebumuxexarowezeva.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c76e2260f12---tilewinipozikivoxa.pdf
    • http://easternsheep.by/app/upload/file/roluxemejavupuf.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/02495e5804982f4c0e423f0c04270162/rejoboboviwekigumef.pdf
    • http://miwon.com.vn/app/webroot/uploads/files/81395690656.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b27245c28db---45559463891.pdf
    • http://szakkepzosiklos.hu/upload/file/6725785443.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/f7d43974cccfd570639d79a7ade25b20/79876439001.pdf
    • https://ovalpolycoats.com/media/mokupexiragulufa.pdf
    • http://bbfrontedelmare.com/userfiles/files/48019559914.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=marketing+strategy+sample+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f431.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF431 16792 bytes
font_01_sfnt_off00010c48.bin
3980cf1ba215bee4aabab4261f12e86b7166fe6225ec7e0c0d2a463b986d1d37
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C48 10920 bytes
font_02_sfnt_off0001255c.bin
eea001a76b3824c42d2069ce5a7aaebaaa78d0390b0325f5ac5fb1ce367df1d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1255C 17188 bytes