Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ed0a58f3bba53fa…

MALICIOUS

PDF

77.1 KB Created: 2021-09-28 23:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 56f049881b85b2d48c282d9cf8158850 SHA-1: 5200dde8ba262fc3e68b583358fe1a186aa346d8 SHA-256: 8ed0a58f3bba53fa5cf637de418de49b43fce6d16616c45423eaf27cc489295a
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

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://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/k7gdhgeujk1s6pqc56ghgu7480/zajupatinaferimizerefixe.pdf In PDF document text
    • http://cartopack.be/Images/file/48523901721.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/rivakadetigijagadefu.pdfIn PDF document text
    • https://pmms-online.com/assets/file/50463115855.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/lavut.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/29751301273.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/tatanetojijuko.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/43581320224.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c0b90a163c---22484877100.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614dfe5e289fe---wotivunumudujitamimejid.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/segamakilaliduwix.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614047aa1dd94---28713531164.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/gozox.pdfIn PDF document text
    • http://khonggianxua.samdigroup.vn/app/webroot/upload/files/96460961161.pdfIn PDF document text
    • http://labradory.pl/file/25553847305.pdfIn PDF document text
    • http://momsystem.ru/public/file/dumemitinovuj.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/xetetivaxo.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/dekegasiwowesevanitisa.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/voserojusaxarileweniz.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/50a37fa5369f6bb89a5d855b33006886/53988339248.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/lazedilatu.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150bdab94c92---pewisunuponevajisiveve.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/xozonefipexabirerasiwafo.pdfIn PDF document text
    • https://homecareangels.ca/files/files/files/92846160917.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=harga+handphone+samsung+android+dibawah+1+jutaPDF 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_off0000c129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC129 19520 bytes
SHA-256: 3eb10f43b5abaa6c09d5e747959fd050039ef7d2e175e32f1ab9951b0875c914
font_01_sfnt_off0000f43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43F 11292 bytes
SHA-256: 7e8e39c876d29345452217c56ce3d9e5b93f59614013641b7f1e4fb803a2f120
font_02_sfnt_off00010e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1