Malicious PDF — malware analysis report

Static analysis result for SHA-256 360eb7d8ce49ca14…

MALICIOUS

PDF

72.8 KB Created: 2021-09-07 22:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e062fffe2492d044aa936667d2d7d734 SHA-1: dbe0ad1ce4a6285fe97c6e2d50ea12ff96b03f47 SHA-256: 360eb7d8ce49ca1470373bb11c095d8997d04aa36269f64bed5d01e4007a664e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links likely serve as lures for phishing or to distribute further malware, aligning with the characteristics of a spearphishing attachment. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

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 https://pistant.ru/uplcv?utm_term=advanced+java+programming+lecture+notes+pdf PDF link annotation
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094756952750---sopifuvipewoba.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/65050923657.pdfIn PDF document text
    • http://www.ezmoving.com/file/xaruvufisakabezesin.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/13134510272.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/manibujeselunapoxarudok.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/hnjemlidgrmkebg0n2b1gp4n63/vubetikozijiduge.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cda4c1dc48b---53349808415.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/83292214189.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/41495955424.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/lozewakem.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16099772feeae5---vexexaliruxafoti.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/78874574186.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bd4610a9f---nodagipedijateresezowen.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/e40a28418274995f0c9ef512efa22c1b/bavemus.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b63f46b57---90267151466.pdfIn PDF document text
    • http://getem.eu/files/file/robefuba.pdfIn PDF document text
    • https://cuatudongsaigon.vn/uploads/files/kowokonowuzadaf.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/3142804350.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/r3s4qqj7i5po2nsjtabhsgqqn4/bukan.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/53595920140.pdfIn PDF document text
    • https://polaria.cz/images/file/nijugiruf.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/korusewigitid.pdfIn PDF document text
    • https://datawire.gr/files/files/vetajisoselaramu.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/47224332045.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_off0000ba9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA9C 15856 bytes
SHA-256: fcd91831628687dc7037d49bb712229d07a428e485722828d5988ee8ae122ecb
font_01_sfnt_off0000e303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE303 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1A 11240 bytes
SHA-256: 7760f140eac1f9c262222a4a511efd81ea33a196716c024ba3c269e2195a6361

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