Malicious PDF — malware analysis report

Static analysis result for SHA-256 396a1b3c6a6069db…

MALICIOUS

PDF

82.0 KB Created: 2021-09-17 17:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: db5609b0357f3fe8ec6eef51685729cc SHA-1: 333b7e9dd28d85287ebb3247eca8aa1822130074 SHA-256: 396a1b3c6a6069db1f5f50a437bd5dcc7a1bb1f728f5791e5363d95bafe85506
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=how+to+convert+android+to+windows PDF link annotation
    • http://collectifff.be/imgdb/accueil/files/rajuwideperewi.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/25620961004.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/56151735078.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/povurawogefigi.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/93044980094.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/gisagizo.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/jamorekupapobaradufojit.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec9e2c6a18---sirafakipamaba.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/wowuravabaniwikupirigip.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109141650104667.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/zazugubogejugonuterela.pdfIn PDF document text
    • http://chayka-svg.ru/files/bajitefipiseposijigojawoj.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/29815174319.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/44465435579.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/nibebizazifu.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb3c9c99d4---kerurudezanunam.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404f2375c42---sixexemo.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/vuvutulidiwigojegete.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210914_C6FC9B89A7F20892.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/bigelinexusobepuxifeku.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b672848728---63331541405.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210912124637.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/soropejubijuxisazopuso.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/vafov.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_off0000dd5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5D 17324 bytes
SHA-256: 184b01da29ba308dd30f28d1fabfe52178d477f19856e0d797b628f42a851393
font_01_sfnt_off00010a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A24 10460 bytes
SHA-256: cadfb00795fefd5ab3aa2a27f54eef400ef4db4ba78370f7a7a1bc10c3252c54
font_02_sfnt_off00012206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12206 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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