Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a8fbb868f66a40f…

MALICIOUS

PDF

83.7 KB Created: 2021-07-17 13:13:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7c1bf794e5f207bda93cbeb23e617abc SHA-1: df5050afcadf2cc6539bb958f1708598ce5784f8 SHA-256: 1a8fbb868f66a40f68c05f46fbc7a118207adf3d418eea5f4cd3aa8cfed25af1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, primarily through its extensive use of links pointing to potentially compromised or disposable hosting. The high number of external URLs, many hosted on WordPress installations or disposable domains, strongly suggests an attempt to redirect users to malicious content or phishing sites. The ClamAV detection and ML classifier further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://effektfilm.de/files/file/zaxewixebozabexolugebo.pdf In PDF document text
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/52577112805.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/waropovagusut.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/1f4c26e4f3d25e6cf98211e3bb47997b/mipep.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/2f3f3a6b1ff4cb4001409537b45b52d0/59048775421.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/seweredinunozo.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c607bc6e9---jusiwefonab.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/df7208b8b6d3d7b670550b51055a4ff4/kavuvig.pdfIn PDF document text
    • http://wahibluedevils76.com/clients/5/55/55d7338a7abcce318bc847d7f34994f5/File/xalija.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/uc171d6i9thqphr4gr6ujschf7/90207900427.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///towutodezubekefewozidav.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160871edf52b93---92268543765.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/galarenajumuwiwoseterij.pdfIn PDF document text
    • http://www.bandungmesin.com/file/57921143398.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/12894941140.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name//files/88159057021.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/topp04mea6ndbskl41npv8sv25/81008858947.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/v5b0l34nt7p03ls4csoq8rl3c6/fupamujobebidujupa.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ep7qln4ci19jah8p67gc1cs0bm/15968950492.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/53902424505.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/litonadozijudelomufor.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/48e75293b2e9fc544d560cdc37717101.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/508c8098035944533fcd12d41d7854e7/158017870.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=grit+strength+and+conditioningPDF 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_off0000e58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA0 16828 bytes
SHA-256: 400eae2d1e145bf39fa17fb4aad97c922d75f31a44a15fa1c0f074eb41174ee0
font_02_sfnt_off0001296d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296D 10640 bytes
SHA-256: 54e0f2c0e2a2e4ad586ced2a7f69dfee460b582c737c42fafbbfc37f079c9a48