Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba73c42603b0d4ce…

MALICIOUS

PDF

84.2 KB Created: 2021-09-07 20:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 6d26bb6f1fe71b78703961d9ca9d543f SHA-1: da7a23aab8d8de1d14ce64b91b0795a4a5b8870a SHA-256: ba73c42603b0d4cead17ebf147db9243a64dde85aaaea7281bcbc2b2ac52ca42
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS platforms. The presence of these links suggests an attempt to direct users to malicious sites for phishing or malware delivery.

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://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd6ba1f818---sezuwuzi.pdf In PDF document text
    • https://burgas-remonti.com/userfiles/file/zulaliwizubepifiru.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/stj7ev73edu9dhmrp1d8gnu1h5/16851408230.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/peluv.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/34tbjnihep19nh2e2o1kdbnck3/27869292010.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/12694455980.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/3f5a082dc502c78a377cad99c0d0e3dd/90052967558.pdfIn PDF document text
    • http://rogo-rotterdam.nl/files/74922960059.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/maqnm61g5a4th33o198p731lk2/13736933361.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/jatetezufaxojidakijon.pdfIn PDF document text
    • https://xn--90aweabvm.xn--p1ai/ckfinder/userfiles/files/nufibivaboredu.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/41173424225.pdfIn PDF document text
    • http://kuppersbusch-center.ru/uploads/files/gerozogegaga.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/43611559754.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876e716b827---kitezuledonafifale.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/sasapewaredopitujusogovu.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/wamawisimo.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce8ded385b---mefikojobodozivixi.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161235974c1c05---42567805977.pdfIn PDF document text
    • http://acril.ru/ufiles/files/rejibekudoweri.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/4287750721.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/63193350058.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711f68191fe---fopugunaruv.pdfIn PDF document text
    • https://tomas-music.com/contents//files/45418286200.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/832c678ef81c2b146037e9223ad64fa6/8742573261.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=rpd+machine+gun+manualPDF 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://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_off0000e1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E0 18608 bytes
SHA-256: af48cfface4fa5f1203ddd77b86ef8c6e0cc0d0b911ea71c3e6fa0d6a23af3f9
font_01_sfnt_off000112cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CF 10620 bytes
SHA-256: 5be894dce4c3c4622201a88964d675a09c1fed7881e4c96c446c05db264436a6
font_02_sfnt_off00012a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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