Malicious PDF — malware analysis report

Static analysis result for SHA-256 4498f6116566f108…

MALICIOUS

PDF

85.8 KB Created: 2021-07-13 19:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e3e01c1b96fb7da294d319fdf8f5907 SHA-1: b9b862e4b74199fa66fc78821099ec4cc67b97f2 SHA-256: 4498f6116566f10854daaa2db06e63b530fa905bde3a28a4345dd5aaca9fd30b
204 Risk Score

Malware Insights

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

The file is a PDF that contains numerous links to external websites, many of which appear to be compromised WordPress installations used for hosting malicious files. The presence of a 'download button' heuristic and ClamAV detection strongly suggests a phishing or malware distribution attempt. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://garglob.ru/uplcv?utm_term=wwe+2k14+apk+download+for+android
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/bf1030d57a25d526ad60f081b83c3bcf/serovas.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609720141f2de---54564291276.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/eaf72e1163c27c4b2882f81be24a7b7c/19546147834.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/bc0fc27a486a7078a8f37ad127874c7a/nomizilofarero.pdf
    • http://chinazzjx.com/d/files/33483221264.pdf
    • http://polimak.pl/userfiles/file/75119857608.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06b0d53d21---39049488777.pdf
    • https://childrencareandliteracysociety.org/userfiles/files/zibevikofuf.pdf
    • http://tecsun-moscow.ru/docs/file/xuwalabi.pdf
    • http://cateringkieuan.com/uploads/userfiles/file/74072652234.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5270477b5---21445415807.pdf
    • http://esistore.be/userfiles/file/40392549360.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac0ed4a568---31867591078.pdf
    • http://cpgny.com/userfiles/files/61181828638.pdf
    • https://bahceneryaman.net/public/content-images/files/javerowodezujivif.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/802bdd39f77880787bc6d3753f162778/kolowebibuwulubobowusipa.pdf
    • http://kwong-cheong.com/userfiles/xofemoletatesaru.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/3e661b6d43d7258c4d2f2f3d996b9552/53369826103.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/00q0a1l2rmrpilv0n227g3c59e/fisavasufido.pdf
    • http://architects-desk.com/uploadsfile/22059253822.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/e9r41l6rt1k57hdue79pcd9rv3/zewitow.pdf
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/74ph2ohgba0ktt7gem9tk7uh71/danuvoredibur.pdf
    • https://ivanamihic.com//files/jodurimajitef.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160baf5015ed39---fugenito.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea0e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0E 16792 bytes
font_01_sfnt_off00010220.bin
964ff24fe659c7757739b2f467f8ed985a054358f7b4a953fabc138557f545a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10220 18028 bytes
font_02_sfnt_off00013170.bin
e5e1c09013d5115ea968e9ee005befad0ad2378c3bce85f07e903a1f9eb5ecf6
pdf-font-stream PDF embedded font (sfnt) at offset 0x13170 10648 bytes