Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2a8addfc72854f0…

MALICIOUS

PDF

85.6 KB Created: 2021-06-29 14:30:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b537f2369a89fe2d0074ba02093d8668 SHA-1: ab77ca3649f7e39fd79cdd62d86d618be6932ac3 SHA-256: b2a8addfc72854f06547ba069b119103d2c4e45a48da8b750a82e6d55719153e
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file exhibits multiple indicators of malicious intent, including links to compromised CMS uploads and disposable hosting, suggesting it is part of a phishing or malware distribution campaign. The presence of a visual download button further supports a lure-based attack pattern. While no scripts were directly extracted, the PDF's structure and heuristic firings strongly suggest it is designed to exploit vulnerabilities or trick users into downloading a malicious payload, likely leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=java+8+in+action+pdf+download
    • https://elnativocoffee.com/silver/upload/files/mineturenefasemuziri.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/8941b4e8e3e226a274c5b10d96060e4f/pemorarowodo.pdf
    • http://ambulatorioveterinariocigliano.com/userfiles/files/10140743938.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb3e707e7e---75897181181.pdf
    • http://unsersohn.ch/images/file/sikanipogeregazix.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086f91a20d9c---30762565989.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080f58db5e9b---7892843736.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/4t7o3n8jiurdjdtfdn23nks96s/dasal.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/40747bbd2c709f95dcd40579005c9c95/98582289050.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092814c9f4af---91942449808.pdf
    • http://aaykpn.com/uploads/editor/files/1833271862.pdf
    • https://kisikana.hr/userfiles/file/85178099937.pdf
    • http://drivingschool-brno.eu/files/44905402826.pdf
    • http://burchiellati.com/file_fck/file/magigit.pdf
    • https://webmenuplus.com/images/file/tokuxokagadidopilarabeno.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2889755e9---74689532635.pdf
    • http://ontsgoi.shop/uploads/files/16959380747.pdf
    • https://plentis.eu/ckfinder/userfiles/files/24586155971.pdf
    • http://creptiles.dk/userfiles/file/sojisodepupepis.pdf
    • http://osc-pribor.ru/products_pictures/file/43507140594.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce575ad49cb---tuged.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f91ec24e2a---togitivulexakozugamile.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef43855218---40023967492.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_off0000ec3b.bin
f365d76b7e2c40e7cf56fbde2709350d2d0166896a00eede215caa175ee6d859
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3B 10564 bytes
font_01_sfnt_off0001048a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1048A 16792 bytes
font_02_sfnt_off00011c9c.bin
70cc3babeed672c180d0d192e13b510a2afdc6a56ce19461127fb261a737105c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9C 17128 bytes