Malicious PDF — malware analysis report

Static analysis result for SHA-256 e50d68b400e1f141…

MALICIOUS

PDF

85.3 KB Created: 2021-09-20 01:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: baa4ff0e02d7fa28a4d0de081b877344 SHA-1: 0d5e573bc082b868b89ef4e074aad479fd79a438 SHA-256: e50d68b400e1f1419d92c2c015cde922d286effe505e659bfbf1173d32c7096b
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document may be instructing the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://smidgel.ru/uplcv?utm_term=flutter+run+simulator+ios PDF link annotation
    • http://agcslohian.com/userfiles/file/nesawubodatitejijif.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/linebutijanuxisegekuwu.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/d4675604ef153ae8ae9f04543db5f144/71201073488.pdfIn PDF document text
    • http://emeat.ru/var/files/sokuxozuvesabaziwemili.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/26676928703.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/9482844785.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/48096559234.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/82208691717.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/97724638863.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16140eec54a592---57075671197.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/161341f16b10e1---gugotux.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/89887708709.pdfIn PDF document text
    • http://retailcop.ca/files/tiludijusogogojuwarixafe.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/64292689571.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/xawunuxadigaw.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/0301e2f26f382fa88079aa6af78316a1/81193708725.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/mewawigomeruxoxopinuju.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/66801020162.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/68371329898.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/55613849219.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/2f7a5b1da4402259ac381f51dfdb1c5e/todefetinapowudixukitape.pdfIn PDF document text
    • http://ahknchem.com/upload/files/91375907863.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/woxaluporotep.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/39870040893.pdfIn PDF document text
    • 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_off0000e97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97A 17792 bytes
SHA-256: 6ce14abb224151d9229880e4c2edf31833520fa30602f7ebeab7c5e9e5b24668
font_01_sfnt_off00011809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11809 10348 bytes
SHA-256: 3bbcc3d8762047834592bebc45e0232a09395aa06bd2a31a6ea4fbe9b38c08b2
font_02_sfnt_off00012f5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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