Malicious PDF — malware analysis report

Static analysis result for SHA-256 72c3db68abd27ed4…

MALICIOUS

PDF

109.3 KB Created: 2021-04-30 14:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 54822e80a6b949917a44ca9bb88e59b2 SHA-1: 8e3ecab3be64b8379717db762aad23e2bb7802e0 SHA-256: 72c3db68abd27ed418d94e5b0cabf173c7bb5a746691bd595129379b6214c842
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9991

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://too.kg/wp-content/plugins/super-forms/uploads/php/files/7caeb8a9515a00f2d1f7a88a34145b91/sipoguzunewamalezu.pdf In PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f4d425973---voxoxonutubikujosujifow.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/t6c1eposreo9aji3jskn68uh1l/54491851171.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/aac8f2dfaadd1b5e9aeffb59f8a36966/4148124178.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16080309ae4a60---feximura.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/1e3c846d18025fcd937d82219fd1dfc6/99603362714.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4d242eb9c---regonilaxubevafopaf.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/lgc26m39biuh673f0rnu7720q0/24620767146.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071a0b8abaa1---nobolujixidonotanexomij.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/66f884ea806eb56c0c687a4c468c2563/24255019755.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16085e4b1bcdf8---voparuduvapudojuwenojep.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/4if5ct18bfalq9ega0e0t2ap81/53636741862.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0312388af---nabibabenenilivugezasuk.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16089a80ea89c6---xogaxojuka.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887ae0303f6---7415158877.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbf5d2804f---xudejiro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=rascals+movie++720p+movies+counterPDF 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://scripts.sil.org/OFLIn 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_off00013450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13450 3704 bytes
SHA-256: 254a51b781310d91c7a187624b0eec90486a6feebc8314d7347add7f53ac49b4
font_01_sfnt_off00014184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14184 5500 bytes
SHA-256: 2ccbabc1959baa27262962d165f1ad0542acf1e8fa366d8005c88019530e8724
font_02_sfnt_off00015434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15434 12436 bytes
SHA-256: 9251ca42d0146dc89995c1f2cc57c943484efe73fa66bee51ae6ff4a4a17399c
font_03_sfnt_off00017c86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C86 16988 bytes
SHA-256: 4fa8e785ba417d95c35ed354d6ea36949de4cc3acdc0169ffe81889ca4cc8e23
font_04_sfnt_off000194d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194D5 5280 bytes
SHA-256: d3922675148be7c041d2b84eb5b0ff4abdc65eb7b5036e3f1051e061ef5bc83e

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