Malicious PDF — malware analysis report

Static analysis result for SHA-256 d35c83d41082362b…

MALICIOUS

PDF

82.3 KB Created: 2021-09-09 13:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b051d37a3aa7db689c73951575be7383 SHA-1: 16841503cd9774b81dacdb8e762386b9bf6eb49b SHA-256: d35c83d41082362bedb362b192f53bf7fdd277649292a62745fcb613c9e40439
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to domains identified as disposable hosting or compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smidgel.ru/uplcv?utm_term=data+obb+ml PDF link annotation
    • http://baharev76.ru/userfiles/file/karopewopezuwoki.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/noruziver.pdfIn PDF document text
    • https://allora-tour.by/var/upload/file/fukamaxapepekokajon.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///73381054990.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/24756654680.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/jelozuzurepivevarib.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/34445624404.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/nanegonaruranat.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/21918449195.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/seruga.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/57204292999.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/pilebinegawinitafu.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/52724563440.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/7159643857.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/96648976362.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/nopizupewodexamajewavozal.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/dujireboxub.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/rasokafix.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/29364322414.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/jomogisewujinekonujid.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138385bb3d10---wofipujuzasuramojixevugo.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/24437204156.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f83a2c9416---topuvefadesuzaf.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387b1e1b73d---fagosexosorozejunedefu.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/74120465135.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_off0000e012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE012 9812 bytes
SHA-256: f80729e742e1792797cf37ff9df93917d9875d75d6c0cfe5b45d017b1de2db6c
font_01_sfnt_off0000f59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59A 17984 bytes
SHA-256: baf905a531ba5524b2ddde8d985501362448f6ea146c3aab073be0195f357c70
font_02_sfnt_off000123ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.