Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd028fb3a77f59d5…

MALICIOUS

PDF

89.4 KB Created: 2021-06-09 10:32:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 18777fdaa6bfc64bba496b005f8504be SHA-1: 404c5f77aae075ef47b6e9bf14d0f116f61bee86 SHA-256: dd028fb3a77f59d530cfde506b6d953ba44fc791ddef071cc815b62c6c77f795
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous URLs pointing to compromised WordPress sites, suggesting it functions as a link farm designed to redirect users to malicious or phishing content. No scripts were extracted, but the presence of multiple external URIs and the link farm structure strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://archism.ru/uplcv?utm_term=french+verb+pouvoir PDF link annotation
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608818ef0a301---16555731120.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/19443154917.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e42f879b71---90331279332.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/2sevug28hutlogdps8bkq8k8g6/fexib.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/16559078222.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/9047f6c1859223702c5997ea8ee4afa6/14721296439.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/sukukapibebe.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/kopojalan.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0700122356---38792267900.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096366d53544---67470667216.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/tp3pde70d9p1b7dc2qcl6p8if3/fufopufubizilebivopulezir.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/3d3fd666351e48dd10054b22e676cb59/12499351382.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/livoxikelukodasev.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/2415526282.pdfIn PDF document text
    • http://fxmeat.com/upload/file/ba303999f3ea034b902c2af26f1f299b.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-4-30/20210430171534303719.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/wubakexotano.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/1319764b58cfc4d9baf2a70f62771159/98768385072.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE148 3312 bytes
SHA-256: 707f044220626673030db1e929683b7e6be6df4515348478205ae719871ec17a
font_01_sfnt_off0000ed2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2A 4560 bytes
SHA-256: 31c9ffea5ee88a835eaa57e325fe7628e5dd477ab2326f34cc19ca4694059cb2
font_02_sfnt_off0000fc85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC85 2628 bytes
SHA-256: 947a22d5170e0a33e875ff6c998fd0763a2eef6813cdc228cce7f17964e1b256
font_03_sfnt_off000107ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AC 12404 bytes
SHA-256: a7861d8fbec518bc8d29817bdba8de3e8d0c9cdaaaaaf53ffc67d968f3f0f0aa
font_04_sfnt_off00013035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13035 16796 bytes
SHA-256: 794da2d4462d1a5a383ae18a1fedc4b15e976ab7924148a4a73b0770ff64ebb2
font_05_sfnt_off000147cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147CD 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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