Malicious PDF — malware analysis report

Static analysis result for SHA-256 55659e2c40832970…

MALICIOUS

PDF

98.5 KB Created: 2021-09-03 20:21:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 623142ad47ecdc66408d07a0ad2ead67 SHA-1: 050b917bfa6d7193aefd4918c020cd5f6458e2b5 SHA-256: 55659e2c4083297069566f8258a15b8f9a4f3eed37722c2422df27ca3b43911c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics point to the document containing a link farm hosted on compromised WordPress sites, with URLs like http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073a39c0c15d---kuduxon.pdf and https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/beb7080daf37fc09c17934f744176da5/ragutevedojap.pdf. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/beb7080daf37fc09c17934f744176da5/ragutevedojap.pdf In PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161104fdbaa2da---sexafelamuj.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/9q4fbrshcb43nu1le8etglp3g6/wulazezinudi.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/388uph7rm1027br8vs5h5hce7i/67955639669.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/93822652652.pdfIn PDF document text
    • http://honda-vo.com/upload/file/baxomaf.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6d3d850a1---wajipuxuwawu.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607221858b948---81505011093.pdfIn PDF document text
    • http://klhl.com/userfiles/file/49110654451.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/44153552522.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/feredovolukutuvuxidif.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073a39c0c15d---kuduxon.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075883aaeb07---movetopife.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be0774197f2---12677095024.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/kebojokuzebozulodumunol.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4e0e92b05---zatizusiwabedi.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca81b6c8ee---nazetivodisejesub.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/85c16c26a4a7408f5bb2023caf546465/93107952341.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/jajedawawesifujutinelar.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/rurogigusutidoduzu.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e04e2f4011---63129846101.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/98942366326.pdfIn PDF document text
    • http://geasit.it/userfiles/files/94176779536.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607898c351b87---warumasorarivuduzilupod.pdfIn PDF document text
    • http://aweibel.com/Photo/file/kewezubuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=malleus+maleficarum+pdf+czPDF 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_off00011028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11028 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001283f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283F 10612 bytes
SHA-256: 98431c62971b1a1b70075c081dc21059c77253f65ad40c6a9fd3ac91ec1b09c2
font_02_sfnt_off0001407a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1407A 23080 bytes
SHA-256: d60ee083e2d0fb50a118f767130f79b615db0fa72c1bad746014d92f39540001